免耕抛栽对水稻产量及其源库特性的影响

于2005-2006年在双季稻田以翻耕处理为对照，研究了免耕抛栽对水稻产量及其源库特性的影响。结果表明, 每公顷有效穗数免耕抛秧处理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。水稻一生中叶面积指数、抽穗后水稻群体光合势、势粒比、颖花伤流量、源库增量比和籽粒平均灌浆速率均免耕处理高于翻耕处理，而粒叶比则相反；剑叶中叶绿素含量以免耕高于翻耕，而丙二醛(MDA)含量以免耕低于翻耕。免耕抛栽水稻后期不易早衰，有利于同化物的转运和结实率的提高。

Effects of No-tillage Cast Transplanting on Rice Yield and Its Source-Sink Characteristics

The experiments were conducted in double cropping rice field during 2005–2006 to study the effects of different tillage methods on rice yield and its source-sink characteristics. The results showed that the effect on panicle number was lower and on filled grain percentage was higher in no-tillage cast transplanting treatment than in conventional tillage cast transplanting treatment. With the time of no-tillage increased, rice yield in different treatments did not differ significantly. The leaf area index during growth stages, the population photosynthetic potential, photosynthetic potential-grain ratio, bleeding potential in neek of spike, ratio of source to sink in increment and mean grain filling rate in no-tillage treatment were higher than those in conventional tillage treatment, but the grain-leaf ratio in no-tillage treatment was lower than that in conventional tillage treatment. The content of chlorophyll was higher and the content of MDA was lower in flag leaf after heading in no-tillage treatment than in conventional tillage treatment. No-tillage treatment was delayed leaf senescence, facilitated the accumulation and transportation of carbohydrate, and improved grain setting rate.