聚丙烯酸钾盐型保水剂在红壤上的施用效果

针对第四纪红粘土发育红壤的土壤结构差、保水性能低和南方季节性干旱等特点，进行保水剂施用效果研究，探讨施用不同浓度保水剂（聚丙烯酸钾）对土壤持水特性、土壤结构及其对玉米生长的影响。结果表明施用保水剂能提高土壤持水能力，抑制蒸发，改良土壤结构，有效促进玉米生长。南方红壤施用0．2％的保水剂可以显著改善土壤有效水分的保持与供应，促进1～0．5mm的土壤团粒结构形成。

Application of Potassium-polyacrylate Water-retaining Agents in Red Soil

The study aims at bad soil structure, lower soil moisture-holding capacity and seasonal drought in quaternary red clay region. Studies conducted on the water-retaining properties, soil structure and the effect on corn growth after the water-retaining agent (Potassium-polyacrylate ) applied with different dosages. Result shows that after applying of water-retaining agent, the soil moisture-holding capacity was enhanced with the increasing of water-retaining agent, evaporation decreased, soil structure meliorated and promoting corn to grow effectively. Applying 0.2% water -retaining agents into red soil could significantly increase the water retaining and supplying ability of soil, and increase soil aggregates of grain diameter of 1~0.5 mm.