覆膜旱作稻田土壤肥力变化的研究

Study on changes of soil fertility in rain fed paddy soils with mulching plastic film:

以常规水作栽培法作对照,对覆膜旱作栽培条件下稻田土壤肥力变化和产量进行研究。结果表明:覆膜旱作稻田土壤容重有所下降,总孔隙度增加显著;阳离子交换量提高,pH值下降明显;土壤有机质矿化明显;土壤有机质、全氮和全磷下降,碱解氮和速效钾显著增加,速效磷略有提高;覆膜旱作稻产量有不同程度的提高。

This paper studied the changes of soil fertility in rain fed paddy soils with plastic film and the yield of rice. Compared with conventional flooded paddy soils, rain fed and mulching plastic film slightly reduced bulk density, increased total porosity of the soils. It greatly reduced the pH value of the soils and increased the cation exchange capacity of the soil. It markedly accelerated mineralization of the soils, which resulted in decreasing organic matter, total N, and total P of the soils and increasing available N, P ,and K of the soils. It could increase the yields of rice.