免耕抛栽水稻的营养特性研究

Study on the nutritional characteristics of no-tillage and cast transplanted rice

摘要: 2005～2006年在双季稻田中研究了免耕抛栽水稻的氮、磷、钾营养特性。结果表明，早、晚稻氮、磷、钾的总吸收量均呈免耕抛秧＞翻耕抛秧＞翻耕移栽趋势；除晚稻氮吸收量抛秧处理极显著高于翻耕移栽处理外，其它均不显著。早、晚稻生育前期群体氮、磷和钾的吸收量免耕处理均比翻耕处理少；生育中、后期免耕抛秧与翻耕抛秧相近，但均高于翻耕移栽。生产100千克子粒所需N、P2O5、K2O的量各处理差异不大。早、晚稻氮、磷、钾的总吸收量与产量均呈显著相关。

Abstract: Field experiments were conducted in double cropping rice field during 2005-2006 to study the effects of no-tillage cast transplanting on rice nutritional characteristics. The results showed that total N, P2O5 and K2O accumulation in early and late rice followed the order that No-tillage cast transplanting (NCT) ＞Conventional-tillage cast transplanting (CCT) ＞Conventional-tillage transplanting (CT), late rice N accumulation of NCT and CCT was higher than that of CT. The early and late rice N, P2O5 and K2O accumulation of NCT in the early stage was lower than that of CCT and CT, NCT and CCT were similar at middle and late stages, and were higher than that of CT. The N, P2O5 and K2O requirement per 100 kg grain of different treatments were the same. There was a close correlation between the amount of N, P2O5 and K2O uptake and rice yield.