Newly developed agricultural chemical agents should be previously evaluated as regards, for example, chemical efficacy on weeds, chemical injury on rice plant and others or influence on conducible living things preparatory to their sales.

For this purpose, practical tests for newly developed chemical agents have so far been performed in test rice paddies. In such a test, a test location having a predetermined area is formed in and isolated from an agricultural rice paddy, in which a predetermined amount of a chemical agent is applied.

An apparatus, for example, as shown in Figs. 1 and 2 has been heretofore known for forming the test location described above.

The test location forming apparatus indicated as a whole by reference numeral 1 in these drawings includes partition walls 2 made of a flexible corrugated plate. The partition walls 2 are formed in annularly square shape as a whole, whose lower ends are inserted in the ground surface G of the rice paddy P so that a test location T having a predetermined area inside the partition walls 2 is formed, which is substantially isolated from the environmental rice paddy P but is under the same circumstances as those in the rice paddy P.

In order to supply water to the test location T, the partition walls 2 are provided with a communication pipe 3 horizontally extending therethrough, through which the water filled in the agricultural rice paddy P is partly drawn into the test location T. The communication pipe 3 may be made of vinyl chloride and has an inner end portion 3A extending into the test location T and an outer end portion 3B extending into the agricultural rice paddy P.

The depth of water filled in the test location T is typically 2 cm to 10 cm, preferably 4 cm to 5 cm. To achieve such a desired depth of water, the communication pipe 3 is provided at a desired height from the ground surface G. On the other hand, the communication pipe 3 is provided with back flow preventing means 4 to prevent any reduction in the desired depth of the water once obtained in the test location T, even when, for whatever reason, the depth of water in the agricultural rice paddy P is reduced.

The back flow preventing means 4 is made of a flexible vinyl tube whose outer opening end portion 4A is secured to the inner end portion 3A of the communication pipe 3 in such a manner as to cover its outer peripheral wall surface of the pipe 3. The inner opening end portion 4B of the flexible tube is formed with a pair of opposed creases positioned in the horizontal direction. These creases serve to enable the inner opening end portion 4B to be closed with a weak force under no external force.

Moreover, the inner opening end portion 4B is provided with a buoyancy providing element 5 for providing a buoyancy to the end portion 4B. The buoyancy providing element 5 is constructed by a so-called air cushion, for example, which is used in transportation of fragile articles.

The buoyancy providing element 5 floats on the surface of the water stored in the test location T when the water flowing from the agricultural rice paddy P into the test location T is stopped, and the inner opening end portion 4B is closed, so that the water in the test location T will not flow outwardly into the agricultural rice paddy P, even if thereafter the water level in the agricultural rice paddy P lowers to below the communication pipe 3 as shown in Fig. 2.

In order to obtain exact data of chemical agents in the test described above, the test location T must be formed in the agricultural rice paddy P so as to have a predetermined area exactly. In order to form such a test location T having an accurate predetermined area, the following steps must be effected that strict surveying is first carried out in the agricultural rice paddy P, on the basis of the result of which, for example, piles are driven as positional marks and strings are strung on the piles, after which the partition walls 2 or corrugated plates are positioned along the strings.

However, such work operations would be very troublesome.

Even when a test location T is formed using only one corrugated plate, one end and the other end of the plate may form one joint so that water must be prevented from flowing in and out at the joint through clearances between both the ends. Heretofore, it was often the case that a corrugated plate was inserted into the ground surface G of the agricultural rice paddy P under the condition of corrugated ends of the plate being merely overlapped each other along their wavy surfaces. In such a procedure, the adherence between the ends of the corrugated plate would be insufficient. On the other hand, the adherence between the ends of the corrugated plate may be enhanced by reinforcement work such as pile driving or land elevation, but additional work steps would be added to the steps for forming the test location T in this case, and such additional steps would require considerable skill.

Further, in order to reduce the troublesome operation in forming a rectangular test location T by bending one plate at as many as four portions step by step, there may be cases using two or more plates, however, which would increase the problematical joints of the ends of corrugated plates described above.

For the purpose of fitting a communication pipe 3 onto a partition wall 2, a fitting aperture would have to be formed in the wall 2. If such a fitting aperture is previously formed at any suitable position in the partition wall 2 and then the partition wall 2 is formed in a rectangular shape having a predetermined area, the fitting aperture may be often positioned near to a corner of the rectangular wall 2, with the result that the fitting of the communication pipe 3 onto the wall 2 may become impossible. Therefore, such a fitting aperture should be formed in the partition wall 2 in an agricultural rice paddy as a job site where a test location T is actually formed.

The present invention has been achieved to solve the problems described above and has an object to provide a test location forming apparatus and a forming method for forming a test location having a predetermined area without requiring any surveying operation and being capable of improving the adherence at a joint without reinforcement work.

In order to achieve the above object, an evaluation test location forming apparatus for forming, in an agricultural field, an evaluation test location having a predetermined area according to a first invention of the present application is characterized by comprising a flexible partition plate formed with a joint communication aperture in each end thereof and capable of being curved to form an annularly circular shape, with the joint communication apertures being aligned with each other, and communication clamp means which extends through the aligned joint communication apertures and which causes the inside and the outside of the annular circle of the partition plate to communicate with each other and causes the ends of the partition plate to closely contact each other.

In order to achieve the above object, an evaluation test location forming apparatus for forming, in an agricultural field, an evaluation test location having a predetermined area according to a second invention of the present application is characterized by comprising at least two flexible partition plates formed with a joint communication aperture in each end thereof and capable of being curved to form one annularly circular shape as a whole with the joint communication apertures being aligned with each other, and communication clamp means which extends through the aligned joint communication apertures and which causes the inside and the outside of the annular circle to communicate with each other and causes the ends of the partition plates to closely contact each other.

In the first and second inventions described above, the evaluation test forming apparatus preferably comprises the back flow preventing means provided in the communication clamp means for preventing the liquid flow from the inside to the outside of the annular circle of the partition plate.

Also, in the first and second inventions, the evaluation test forming apparatus preferably comprises the back flow preventing means provided in the communication clamp means for selectively preventing the liquid flow from the outside into the inside of the annular circle and from the inside to the outside of the annular circle of the partition plate.

In the first and second inventions, moreover, preferably the communication clamp means includes a pair of pipes engageable with each other, one of the pipes having a male screw portion and a flange portion and the other pipe having a female screw portion adapted to be threaded onto the male screw portion of the one pipe and a flange portion.

In the first and second inventions, furthermore, the back flow preventing means for selectively preventing the liquid flow from the outside into the inside of the annular circle and from the inside to the outside of the annular circle of the partition plate is preferably constructed by bending at least one pipe of the pipes.

In order to achieve the above object, an evaluation test location forming apparatus for forming, in an agricultural field, two evaluation test locations each having a predetermined area and communicated with and connected to each other according to a third invention of the present application is characterized by comprising two flexible partition plates each formed with a joint communication aperture in each end thereof and each capable of being curved to form an annularly circular shape with the joint communication apertures being aligned with each other, and communication clamp means which extends through the aligned joint communication apertures of one of the partition plates and the aligned joint communication apertures of the other partition plate and which causes the annular circles of these partition plates to communicate with each other and causes the ends of these partition plates to closely contact each other.

In order to achieve the above object, an evaluation test location forming method for forming, in an agricultural field, an evaluation test location having a predetermined area according to a fourth invention of the present application is characterized by comprising the steps of curving a flexible partition plate formed with a joint communication aperture in each end thereof into an annularly circular shape to cause the joint communication apertures to be aligned with each other, causing the inside and the outside of the annular circle of the partition plate to communicate with each other through the aligned communication apertures, while causing the ends of the partition plate to closely contact each other, and installing the thus obtained annularly circular partition plate in the agricultural field.

In order to achieve the above object, an evaluation test location forming method for forming, in an agricultural field, an evaluation test location having a predetermined area according to a fifth invention of the present application is characterized by comprising the steps of using at least two flexible partition plates formed with a joint communication aperture in each end thereof to cause them to be curved into an annularly circular shape as a whole and to cause the joint communication apertures of the adjacent ends of the partition plates to be aligned with each other, causing the inside and the outside of the annular circle to communicate with each other through the aligned joint communication apertures, while causing the ends of the partition plates to closely contact each other, and installing the thus obtained annularly circular partition plates in the agricultural field.

In order to achieve the above object, an evaluation test location forming apparatus for forming, in an agricultural field, two evaluation test locations each having a predetermined area and communicated with and connected to each other according to a sixth invention of the present application is characterized by comprising the steps of curving a first flexible partition plate formed with a joint communication aperture in each end thereof into an annularly circular shape to cause the joint communication apertures to be aligned with each other, curving a second flexible partition plate formed with a joint communication aperture in each end thereof into an annularly circular shape to cause the joint communication apertures to be aligned with each other, causing the annular circles of the first and second partition plates to communicate with each other through the aligned joint communication apertures of the first partition plate and the aligned joint communication apertures of the second partition plate and causing the ends of these partition plates to closely contact each other, and installing the thus obtained two annularly circular partition plates in the agricultural field.

In order to achieve the above object, an evaluation test location forming apparatus for forming, in an agricultural field, an evaluation test location having a predetermined area according to a seventh invention of the present application is characterized by comprising a flexible partition plate formed in each end with a joint communication aperture and capable of being curved to form an annularly circular shape with the joint communication apertures aligned with each other, and clamp means which extends through the aligned joint communication apertures to cause the ends of the partition plate to closely contact each other.

In order to achieve the above object, an evaluation test location forming method for forming, in an agricultural field, an evaluation test location having a predetermined area according to an eighth invention of the present application is characterized by comprising the steps of curving a flexible partition plate formed with a joint aperture in each end thereof into an annularly circular shape to cause the joint apertures to be aligned with each other, extending clamping means through the aligned apertures to cause the ends of the partition plate to closely contact each other, and installing the thus obtained annularly circular partition plate in the agricultural field.

In the first invention of the present application, the partition plate is constructed to be able to be curved so that the joint communication apertures formed in the respective ends can be aligned with each other, thereby enabling the partition plate to be formed into an annular circle. Furthermore, by previously determining the distance between the joint communication apertures at a given value, the annular circle of the partition plate having a desired area can be readily formed. Further, the communication clamp means causes the inside and the outside of the annular circle of the partition plate to communicate with each other and also causes the ends of the partition plate to closely contact each other, thereby improving the adherence at the ends and eliminating any reinforcing work required in the prior art.

In the second invention of the present application, at least two partition plates are constructed to be able to be curved to form one annular circle as a whole in such a manner as to enable the joint communication apertures formed in the adjacent ends of the partition plates to be aligned with each other, thereby simply forming the partition plates into the annular circle. Furthermore, by previously determining the distance between the joint communication apertures of each of the partition plates at a given value, the annular circle of the partition plates having a desired area can be readily formed. Further, the communication clamp means causes the inside and the outside of the annular circle of the partition plates to communicate with each other and also causes the ends of the partition plate to closely contact each other, thereby improving the adherence at the ends and eliminating any reinforcing work required in the prior art.

In the third invention of the present application, the two partition plates are constructed to be able to be curved in such a manner as to enable the joint communication apertures formed in respective ends to be aligned with each other so that two annular circles of the partition plates can be formed in a simple manner.

Furthermore, by previously determining the distances between the joint communication apertures of the respective partition plates at predetermined values, two annular circles having desires areas of the partition plates can be readily formed. Further, the communication clamp means can cause the annular circles of the two partition plates to communicate with each other and also the ends of the two partition plates to closely contact each other. to improve their adherence.

In the fourth invention of the present application, as the annular circle is formed by curving the partition plate, an annular circle of the partition plate having a desired area can be easily formed by previously determining the distance between the joint communication apertures at a predetermined value. Moreover, as the inside and the outside of the annular circle of the partition plate are communicated with each other and the ends of the partition plates are closely contacted to each other, the reinforcing work required in the prior art can be eliminated.

In the fifth invention of the present application, as at least two partition plates are constructed to be curved to form one annular circle in its entirety, the distances between the joint communication apertures are previously determined at predetermined values so that the annular circle of the two partition plates having a desired area can be readily formed. Moreover, the inside and the outside of the annular circle of the partition plates are caused to communicate with each other and the ends of the two partition plates are caused to closely contact each other so that the reinforcing work required in the prior art can be eliminated.

In the sixth invention of the present application, as two annular circles are formed by curving two partition plates, respectively, the annular circles of the partition plates having desired areas, respectively, can be easily formed by previously determining the distances between the joint communication apertures of the respective partition plates at predetermined values. Moreover, the annular circles of the two partition plates are caused to communicate with each other, while the ends of the two partition plates are caused to contact each other so that the reinforcing work required in the prior art can be eliminated.

In the seventh invention of the present application, as the partition is constructed to be able to be curved in such a manner as to enable the joint apertures formed in the respective ends to be aligned with each other, an annular circle of the partition plate can be easily formed. Moreover, the annular circle of the partition plate having a desired area can be easily formed by previously determining the distance between the joint apertures at a predetermined value. Also, the ends of the partition plate can be caused to closely contact each other by means of clamping means. In the present invention, the communication between the inside and the outside of the annular circle of the partition plate is not needed. The clamping means comprises a pair of male member and female member engageable with each other, one of them extending through the aligned joint apertures to engage the other member, whereby the ends of the partition plate are preferably clamped to each other. Preferably, these male and female members are solid.

In the eighth invention of the present application, as the annular circle is formed by curving the partition plate, the annular circle of the partition plate having a desired area can be readily formed by previously determining the distance between the joint apertures at a predetermined value. Moreover, as extending the clamping means through the aligned joint apertures causes the ends of the partition plate to closely contact each other, there is no need for the work for improving the adherence of the ends of the partition plate. In the present invention, there is no need to communicate the inside and the outside of the annular circle of the partition plate with each other.

The clamping means comprises a pair of male member and female member engageable with each other, one of them extending through the aligned joint apertures to engage the other member, whereby the ends of the partition plate are preferably clamped to each other. Preferably, these male and female members are solid.

Embodiments of the present invention will be explained below with reference to the following drawings. These embodiments are applications of the present invention to an evaluation test location forming apparatus to be used in an agricultural rice paddy.

Referring to Fig. 3, reference numeral 11 denotes an evaluation test location forming apparatus according to the first embodiment of the present invention. The evaluation test location forming apparatus 11 is installed on (the ground surface G) of an agricultural rice paddy P and used to form a test location T in a similar manner to the prior art described in the paragraphs of the background art.

The evaluation test location forming apparatus 11 includes a partition plate 12 shown in Fig. 3. The partition plate 12 is formed of one flexible sheet and can be made of, for example, vinyl chloride as can be clearly understood by referring to Fig. 4. The partition plate 12 has two ends 12A and 12B each formed with a joint communication apertures 13A and 13B.

The evaluation test forming apparatus 11 also includes communication clamp means 14, which functions as follows. When the partition plate shown in Fig. 4 is curved into an annularly circular shape to cause the joint communication apertures 13A and 13B to be aligned with each other as shown in Fig. 3, the communication clamp means 14 extends through the joint communication apertures 13A and 13B to cause the inside and the outside of the annular circle of the partition plate 12 to communicate with each other and to cause the ends 12A and 12B to closely contact each other.

As clearly shown in Fig. 5, the communication clamp means 14 includes an external female pipe 15 and an internal male pipe 16 of a pair engageable with each other. The external female pipe 15 has a cylindrical body 15A in the form of a cylinder in its entirety and a clamp portion or flange portion 15B formed on the end of the cylindrical body 15A on the side to be jointed, on which end is formed with a female screw 15C. The internal male pipe 16 has a cylindrical body 16A in the form of a cylinder in its entirety, a clamp portion or flange portion 16B formed on the cylindrical body 16A and a cylindrical extension extending from the flange portion 16B, on which cylindrical extension is formed with a male screw 16C. In addition, the internal male pipe 16 is equipped with back flow preventing means 4 as described in connection with the test location forming apparatus 1 of the prior art. In more detail, the back flow preventing means 4 has an outer opening end portion 4A secured to and covering the outer surface of the cylindrical body 16A of the internal male pipe 16. The back flow preventing means 4 will not be described here further since its other construction and functions have already been explained.

When the communication clamp means 14 is fitted in the aligned joint communication apertures 13A and 13B of the partition plate 12, the cylindrical extension formed with the male screw 16C of the internal male pipe 16 extends through the joint communication apertures 13A and 13B of the partition plate 12, for example, from the inside of the annularly and circularly shaped partition plate 12 so that the flange portion 16B is caused to abut against the partition plate 12. Preferably, the joint communication apertures 13A and 13B are formed slightly larger in dimension and shape than the diameter of the male screw 16C of the internal male pipe 16, thereby preventing the internal male pipe 16 from easily falling off the partition plate 12 even when the internal male pipe 16 is not being manually supported.

The female screw 15C of the external female pipe 15 is threaded onto the male screw 16C of the internal male pipe 16, which is extending out of the partition plate 12 (toward the agricultural rice paddy P), so that the flange portion 15B of the external female pipe 15 abuts against the partition plate 12 to clamp the ends 12A and 12B of the partition plate 12 by means of the flange portions 16B and 15B of the internal male and external female pipes 16 and 15, respectively.

Fitting of the communication clamp means 14 in the annularly and circularly shaped partition plate 12 enables the inside and the outside of the annularly and circularly shaped partition plate 12 to be communicated with each other and, at the same time, the ends 12A and 12B to closely contact each other.

The evaluation test location forming apparatus 11 thus formed is inserted into the ground surface G of an agricultural rice paddy P to form a test location T in a simple manner.

By the way, various dimensions of the partition plate 12 may be determined depending on the area of the test location T to be formed and level of water to be supplied into the test location T.

In the case that forming a test location T having an area of, for example, 1 m2 is required, the distance between the joint communication apertures 13A and 13B of the partition plate 12 under the condition shown in Fig. 4 is 354 cm. As the circumference of the annularly circular partition plate 12 (Fig. 3) formed by the partition plate 12 is 354 cm, the diameter and radius of the annularly circular partition plate 12 are 112.73885 cm and 56.369426 cm, respectively, assuming that the ratio of circumference to diameter of circle is 3.14. Accordingly, the area in the annularly circular partition plate 12 or the area of the test location T is 9977.3883 cm2 which is substantially equal to 1 m2 In the case where a more accurate area 1 m2 of the test location T is desired, a more accurate value for the distance between the joint communication apertures 13A and 13B of the partition plate 12 may be used.

According to the evaluation test location forming apparatus 11, as the distance between the joint communication apertures 13A and 13B of the partition plate 12 can be formed based on a value obtained by a previous calculation as described above, a test location T having a desired area can be readily formed without requiring any survey in an agricultural rice paddy P as in the case of the test location forming apparatus 1 of the prior art.

In the evaluation test location forming apparatus 11 according to the present invention, as the partition plate 12 can be previously formed with the joint communication apertures 13A and 13B for fitting the communication pipes 15 and 16, boring operation in an agricultural rice paddy P required in the test location forming apparatus 1 of the prior art is eliminated because there is no disadvantage owing to the previous formation of such joint communication apertures 13A and 13B.

Furthermore, in the evaluation test location forming apparatus 11 according to the present invention, the ends 12A and 12B of the annular partition plate 12 to be jointed are provided with the joint communication apertures 13A and 13B into which the pipes 15 and 16 are fitted, and simultaneously therewith the ends 12A and 12B of the partition plate 12 are clamped to be closely contact each other, so that clearances between the ends 12A and 12B of the partition plate 12 to be jointed can be smaller than those caused in the test location forming apparatus 1 of the prior art. In this manner, the reinforcing work is not necessary which is carried out in the test location forming apparatus 1 of the prior art.

Fig. 6 illustrates an evaluation test location forming apparatus 21 according to the second embodiment of the present invention.

The evaluation test location apparatus 21 includes two partition plates 22A and 22B which are the same in construction as the partition plate 12 of the evaluation test location apparatus 11 of the first embodiment, and communication clamp means 14 which is also the same as the communication clamp means 14 of the evaluation test location forming apparatus 11 of the first embodiment.

When the evaluation test forming apparatus 21 is assembled as shown in Fig. 6, the partition plates 22A and 22B are each curved and formed into an annular circle, and joint communication apertures formed in both the ends of each partition plate are aligned with each other in the same manner as in the partition plate 12 of the evaluation test location forming apparatus 11. Thereafter, the aligned joint communication apertures of the partition plate 22A and the aligned joint communication apertures of the partition plate 22B are aligned with each other in such a manner that outer surfaces of the partition plates 22A and 22B contact each other. For example, from the inside of the annularly and circularly shaped partition plate 22A, the cylindrical extension formed with a male screw 16C of the internal male pipe 16 of the communication clamp means 14 extends through the four joint communication apertures of the partition plates 22A and 22B so that the flange portion 16B abuts against the partition plate 12 and the cylindrical extension formed with the male screw 16C of the internal male pipe 16 extends into the inside of the annularly and circularly shaped partition plate 22B.

The female screw 15C of the external female pipe 15 is then threaded onto the male screw 16C of the internal male pipe 16 extending into the interior of the partition plate 22B so that the flange portion 15B of the external female pipe 15 is caused to abut against the partition plate 22B, thereby clamping the four ends of the partition plates 22A and 22B by means of the flange portions 16B and 15B of the internal male and external female pipes 16 and 15, respectively.

The evaluation test location forming apparatus 21 thus formed is inserted into the ground surface G of the agricultural rice paddy P to form two test locations T1 and T2 communicated with and connected to each other by means of the communication clamp means 14.

This evaluation test location forming apparatus 21 is suitable for testing chemical agent injury caused by flowing out of water in a rice paddy. In more detail, for example, in the case where a new chemical agent is given to the test location T1 but not to the test location T2, by observing variances in the test locations T1 and T2, the influence of the chemical agent on another rice paddy can be inspected in simulation as regards the case where the chemical agent is given only to one rice paddy of two adjacent rice paddies communicating with each other.

Fig. 7 illustrates communication clamp means 30 of a modified embodiment of the communication clamp means 14 used in the evaluation test location forming apparatus 11. the communication clamp means 30 is substantially similar in construction to the communication clamp means 14 only with the exception that the communication clamp means 30 has an external female pipe 30 whose cylindrical body 30A is curved, whereas the cylindrical body 15A of the external female pipe 15 of the communication clamp means 14 is substantially horizontally and linearly extending.

By angularly forming the cylindrical body 30A in this manner or constructing the pipe 15 by an elbow (joint), it is possible to stop arbitrarily or selectively the water flowing from surrounding rice paddy P into the test location T and from the test location T into the surrounding rice paddy P. In other words, the angular cylindrical body 30A constitutes selective back flow preventing means.

As shown, for example, in Fig. 7, when the test location T contains an amount of water with a desired depth, if the depth of water in the surrounding rice paddy P exceeds the desired depth of water in the test location T, the undesirable water flow from the rice paddies P to the test location T can be prevented merely by turning the external female pipe 30 relative to the partition plate 12 so as to permit the opening 30a of the cylindrical body 30A to direct upward. Moreover, when the test location T has been filled with the water of the desired depth, even if the depth of water in the surrounding rice paddy P becomes less than the desired depth of water in the test location T, the water flow from the test location T to the rice paddy P can be prevented by the communication clamp means 30.

The present invention is not limited to the embodiments described above and various modifications are possible as described below.

For example, while the aspect of the evaluation test location forming apparatus 21 is explained without use of the back flow preventing means 4, it will be apparent that the back flow preventing means 4 may be provided in each of the test location T1 and T2 depending on contents of the test. Accordingly, the evaluation test location forming apparatus 21 may also be provided with the communication clamp means 30 instead of the communication clamp means 14 for the purpose of arbitrarily or selectively stopping the water flow between the test location T1 and T2.

In the communication clamp means 14 and 30, although the external pipe is of the male type and internal pipe is of the male type, the external pipe may be of the male type and the internal pipe may be of the female type. In the communication clamp means 30, the internal pipe may be an elbow (joint).

Furthermore, in the evaluation test location forming apparatus 11, although the one partition plate 12 is used to form the test location T having the area of 1 m2, two partition plates 12 may be used to form a test location T of 4 m2 with ease. In other words, the joint communication aperture 13A of one partition plate 12 and the joint communication aperture 13B of the other partition plate 12 are aligned with each other and their ends formed with these aligned apertures are engaged with and clamped to each other by the communication clamp means 14 and 21, while similarly the joint communication aperture 13B of the one partition plate 12 and the joint communication aperture 13A of the other partition plate 12 are aligned with each other and the ends formed with these aligned apertures are engaged with and clamped to each other by the communication clamp means 14 and 30. The test location T of 4 m2 is formed in this manner. (Each) of the communication clamp means 14 used is preferably provided with the back flow preventing means 4.

As described above, the back flow preventing means 4 and the communication clamp means 30 function as means for preventing the undesirable flowing of water from the rice paddy into the test location and further the communication clamp means 30 functions as means for preventing the undesirable flowing of water from the test location into the rice paddy P. However, instead of these means, existing check valve mechanisms may be used.

The test location forming apparatus and method according to the present invention can be generally widely utilized in various tests such as cultivation test, fertilizer test and the like other than agricultural chemical agent test.