播期和密度对超级稻天优3301产量形成的影响

以超级杂交稻天优3301为材料,在大田中采用双因素裂区设计,研究播期和移栽密度对天优3301产量及构成因素的影响.结果表明,播期对单位面积穗数、穗粒数、结实率、千粒重及产量均有显著影响,移栽密度对产量及其构成因素的影响也显著.移栽密度主要影响穗数,随着移栽密度的增加,单位面积有效穗数显著增多,穗粒数下降,而结实率和千粒重相对稳定.在建阳及闽西北地区,超级杂交稻天优3301的适宜播期为5月20～30日,适宜栽插密度为25.0万丛·hm-2,在此条件下可形成足够穗数和穗粒数,从而获得较高的产量.

Effects of Seeding Time and Cultivation Density on Yield of Super Hybrid Rice Tianyou 3301

Using the split plot design,a field experiment was conducted with different sowing date(5/20、5/30、6/10、6/20 and 6/30) and transplanting densities(18,25and 36 hills·hm-2) by using a super hybrid rice Tianyou 3301.The results showed that sowing date had significantly effect on the panicles per unit area,grain number per panicle,seed setting rate,1000-grain weight and grain yield.It had significant influence of transplanting density on yield and yield components for Tianyou 3301.The transplanting density mainly affected panicles,as the transplanting density increased,the effective panicles per unit area significantly increasd,grain number decreased.But there was no significant difference in 1000-grain weight and seed setting rate among different densities.Therefore,the super hybrid rice Tianyou 3301 in Jianyang and the Northwestern Fujian under the experimental conditions which are transplanting seedlings at May 20 and 30 with transplanting density of 250 000·hm-2 and 360 000·hm-2 respectively,can form adequate panicles grain number and obtain a higher yield.