摘要
对经过 10年自然免耕后稻田的基本肥力特征、主要微生物类群的数量以及水稻农艺性状进行了探讨。结果表明 :土壤肥力方面 ,该免耕方式能提高土壤肥力 ,垄作和厢作的全氮、全磷、速效氮、速效磷以及有机质显著比常规平作高 ,且上层 (0～ 7.5cm)和下层 (7.5～ 30cm)的肥力水平差异不显著 ,但仍有上层高于下层的规律 ;微生物特征方面 ,各处理细菌数量呈明显的季节性变化 ,但免耕处理的微生物生长条件较稳定 ,季节性不明显 ;自生固氮菌与纤维素分解菌之间相互促进 ,有利于有机质的积累 ;自然免耕能提高作物产量 ,减少杂草生长。
The basic fertility characteristics, microbial composition and agronomic characters of the rice crops were investigated on paddy soil, where no-tillage and ridge culture had been practiced for 10 years. No-tillage proved to be beneficial for improving soil fertility, and total N, total P, available N, available P and organic matter were higher in the soil under ridged culture than in soil of the conventional cultural mode. Fertility level in the 0～7.5 cm soil layer was higher than in the 7.5～30 cm layer, but the difference was non-significant statistically. The quantity of bacteria was greatest in spring and smallest in early autumn regardless of the culture mode, but the seasonal fluctuation was smaller in the no-tillage culture. Rhizobacter and cellulose decomposing bacteria promoted each other, benefiting organic matter accumulation. No-tillage was shown to be favorable for yield increase and to suppress the growth of weeds.
出处
《西南农业大学学报（自然科学版）》
CSCD
北大核心
2002年第1期82-85,共4页
Journal of Southwest Agricultural University
基金
重庆市科委青年专家基金资助 (1 9991 31 3)
