To accelerate replantation of the land in which a growth of a plant is difficult because the ground is lowered to under a water surface by a rising of a water level of a dam, etc., or the ground is exposed and by a lowering of the water level and becomes a dry land or prevent collapsing of the edge of the water of livers or lakes and marshes by using a specific water absorptive resin and strongly waterproofing plants.
This replanting method at the edge of the water uses a water absorptive resin having a relation, in a case when a water absorption ratio at a Knop's solution is absorbed one time is defined as A1 and a water absorption ratio after the Knop's solution is repeated 5 times to water absorption and drying is defined as A5, the A1 to A2 is within the formula: 0.7≤(A5/A1)≤1.3, preferably a crosslinked oxyethylene-based polymer, a crosslinked vinyl alcohol-based polymer, a crosslinked acrylamide-based polymer, a crosslinked N-vinyl carboxylic amide-based polymer, etc., and strongly waterproofing plants preferably capable of glowing even are sunk in the water, such as Salicaceae, Equisetaceae, Equisetum palustre L or Equisetum fluviatile L.
YAMAGUCHI TETSUHIKO
ISHIOKA SHINYA
SHOWA DENKO KK