不同耕作方式对水稻产量和土壤肥力的影响

于2005～2006年在双季稻田研究了不同耕作方式对水稻生长、产量和土壤肥力的影响。结果表明:免耕抛秧水稻根干重低于翻耕移栽稻，根系绝大部分分布在表层土壤，根系活力比翻耕处理的高，分蘖时间比翻耕移栽的早而比翻耕抛秧的迟；每公顷有效穗数略低于翻耕抛秧而高于翻耕移栽，结实率高于翻耕处理。随着免耕次数的增加，各处理产量基本持平；免耕1年有利于土壤物理性质的改善，免耕有利于土壤养分在表层土壤富集。

Effects of different tillage methods on rice yield and soil fertility

Field experiments were conducted in double cropping rice field during 2005–2006 to study the effects of different tillage methods on the changes of rice growth, its yield and soil fertility. The results showed that root dry weight in No-tillage cast transplant treatment was lower than that in conventional tillage transplant treatment，root activity and filled grain percentage was higher than that in conventional tillage treatment, the profile distribution of root amount was mainly in the 0–5cm soil layer, the tillering time was earlier than that in conventional tillage transplant treatment, but was slower than that in conventional tillage cast transplant treatment. The effect on panicle number was lower than that in conventional tillage cast transplant treatment, while was higher on filled grain percentage than that in conventional tillage transplant treatment. As the time of no-tillage prolonged, rice yield with different treatments did not differ significantly. The no-tillage treatment of one year improved soil physical properties, and increased soil nutrient contents in the surface layer.