氮肥和密度对两系亚种间杂交稻“65396”产量及构成因子的影响

Influence of Transplanting Density and Applied N Fertilizer on the Yield of Intersubspecific Hybrid Rice 65396 and Its Components

以两系杂交稻新组合“65396”为试验材料,分析了不同氮肥用量(纯N 0 kg·hm-2、120kg·hm-2、240kg·hm-2、360 kg·hm-2)和栽插密度(21×104穴·hm-2、27 ×104穴·hm-2、33×104穴·hm-2)对产量及产量构成因子的影响。结果表明:栽插密度对65396结实率和千粒重影响较小,对单位面积穗数和每穗粒数影响较大,且在(21～33)×104穴·hm-2的密度范围内,产量差异未达显著水平;氮肥用量对穗数、每穗粒数和千粒重影响较大。纯N水平在360 kg·hm-2时,增穗作用不显著,反而显著降低每穗粒数和千粒重。试验结果表明:在中等肥力土壤中,施纯N240kg·hm-2,栽插密度在27×104穴·hm-2左右均有利于该组合的穗数、每穗粒数、结实率和千粒重协调发展,获得高产。

The effects of different level of nitrogen fertilizer (0 kg/hm2, 120 kg/hm2, 240 kg/hm2 and 360 kg/hm2) and transplanting density (21 × 104hole/hm2, 27 × 104 hole/hm2, 33 x 104hole/hm2) on the yield and its components for intersubspecific hybrid rice 65396 were studied based on field experiments in 1999. Influence of transplanting density on panicle per unit area and grain number per panicle was higher than that on seed-setting rate and 1 000-grain weight. The differences among yields in the treatments with transpanting density ranging from (21 -33) × 104 hole per hectare were not significant. Effect of nitrogen fertilizer on seed-setting rate was lower than that on panicle per unit area, grain number per panicle and 1 000-grain weight. Grain number per panicle and 1 000-grain weight were decreased significantly in the treatment with 360 kg/hm2 nitrogen fertilizer. Panicle number, grain number per panicle, seed-setting rate and 1 000-grain weight of the 65396 will be well coordinated to get high yield when it is being transplanted at the density about 27 × 104 holes per hectare and being applied with 240 kg/ hm2 nitrogen in the medium-fertility field.