氮肥和栽插密度对功能型水稻不同基因型的产量及抗性淀粉(RS)含量的影响

Effects of Transplanting Density and Nitrogen Fertilizer on Yield and Resistant Starch(RS) in Different Genetic Function Rice

以抗性淀粉(RS)含量不同的4个水稻品系为材料,研究不同氮肥水平和栽插密度对水稻不同品系的产量及抗性淀粉含量的影响。结果表明:①N肥用量和栽插密度对穗数、每穗粒数、结实率和千粒重影响较大,在高氮水平下,提高栽插密度反而显著降低结实率和千粒重,导致减产和抗性淀粉累积下降。②在中等肥力土壤上,RS21和浙辐优1号对氮素的反应较敏感,施纯N337.5 kg/hm2,每穴栽插2株,高峰苗控制在500.00万/hm2左右;而功米1号和功米3号施纯N 300.0 kg/hm2,每穴栽插4株,高峰苗控制在450.0万/hm2,有利于4个品系抗性淀粉的累积,能较好地协调穗数、结实率和千粒重的关系而获得高产。

A field experiment was conducted with different transplanting densities and nitrogen fertilizer using four different resistant starch varieties rice. The main result showed that： （i） The significant effect of nitrogen fertilizer and transplanting density on panicle number, grain number per panicle, seed-setting rate and 1000-grain weight was observed. Under the high nitrogen fertilizer, seed-setting rate, 1000-grain weight,yield and resistant starch were decreased significantly in the treatment with increasing transplanting density. （ii） The close relation- ship among panicle number,seed setting rate and 1000-grain weight,yield and resistant starch would be obtained under medium-fertility field with four varieties rice. RS21 and Zhefuyou 1 sensitive to N application were higher with nitrogen application of 337.5 kg/ha,transplanting density of 2 plant/hole and high peak seedling of 500.0×10^4/ha. And Gongrai 1 and Gongmi 3 had high yields with nitrogen application of 300.0 kg/ha,transplanting density of 4 plants/hole and high peak seedling of 450.0 ×10^4/ha.