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通过田间试验研究了水稻不同生育时期开沟深施氮肥对水稻叶片、叶鞘和茎秆重以及生物产量和籽粒产量的影响。结果发现 ,孕穗期开沟深施氮肥处理比分蘖期开沟、穗分化始期开沟和不开沟处理的水稻叶片干重保持最大值 (2 9g·穴- 1 )时间长 ,叶面积指数达到最大值 (LAI=8 9)后缓慢下降 ;叶鞘干重 (2 7g·穴 - 1 )变化小 ;处理以后茎秆干重 (4 3g·穴 - 1 )稳步增加。孕穗期开沟施肥处理的水稻生物产量 (0 73g·d- 1 ·穴- 1 )递增速度快 ,籽粒产量 (10 43 4kg/hm2 )高。与不开沟施肥相比 ,孕穗期开沟施氮对产量增加作用最大 ,为水稻开沟深施氮肥的最佳时期 ;其次为穗分化始期 ;分蘖期开沟施氮效果较差 ,但仍有一定的增产作用
Field experiments were conducted to study the effects of nitrogen and nitrogen fertilization at different growth stages of rice on leaf weight, leaf sheath and stalk weight, as well as bio-yield and grain yield of rice. The results showed that the nitrogen application at the booting stage was longer than that at the tillering stage, and the dry weight of the rice leaves at the initial stage of spike differentiation was longer (29g · hk-1), and the leaf area index reached The maximum value (LAI = 8 9) decreased slowly. The dry weight of leaves (27 g · cave - 1) changed little. The stem dry weight (43 g · cave - 1) increased steadily after treatment. The yield of rice (0 73 g · d-1 · L-1) increased rapidly and the grain yield (10 43 4 kg / hm2) was high at the booting stage. Compared with the no-till fertilization, nitrogen application at the booting stage had the greatest effect on the increase of yield, which was the best period for nitrogen application in deep-seeding ditch of rice, followed by the initiation of spike differentiation, A certain increase in production