一季晚稻直播栽培与育秧移栽的农艺性状比较

选用有代表性的水稻品种（组合）两优培九（两系杂交稻）、绵2优838（三系杂交稻）、湘晚籼11号（优质常规稻）、扬稻6号（高产常规稻）为试验材料，采用裂区设计，通过直播栽培与育秧移栽比较试验，研究不同水稻品种（组合）农艺性状、产量构成因素的差异．结果表明，两种栽培方式下各品种产量之间存在显著差异，直播栽培相比育秧移栽产量高；从产量构成因素上分析，直播栽培增产的原因是水稻有效穗数增多、结实事和千粒重略有增加，其中有效穗数对产量贡献最大，其直接通径系数为0．8677．直播栽培对水稻分蘖、株高、生育期及叶面积有一定影响．

Different Characters of Single-Cropping Late Rice under Direct-Seeding and Transplantation Cultivation

Four typical rice varieties(or combinations) were grown under direct-seeding cultivation and transplantation cultivation by split plot design,and the effects of direct-seeding cultivation on agronomic characters,yield components were investigated.The results showed that there were significant differences between yield of different varieties under different cultivations.It increased markedly under direct-seeding cultivation.The main reasons for the yield increasing under direct-seeding cultivation were that there were more effective panicle number,higher seed setting rate and 1000-grain weight.Among yield components,the effective panicle number had the biggest effect on the yield;whose path coefficient was 0.867 7.The plant height,growth duration,and leaf area were also influenced under direct-seeding cultivation.