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以辽棉19号和美棉33B为材料,于2008年在东北特早熟棉区设置不同的棉花种植密度(每公顷75000、97500、120000株)和施氮量(0、240、480kg.hm-2),研究了施氮量和种植密度对东北特早熟棉区棉花生物量、氮素累积特征和氮素累积利用率的影响.结果表明:两个品种的棉花生物量和氮素累积量随棉花生育进程的动态变化均符合Logistic模型;种植密度和施氮量显著影响棉花氮素累积动态特征以及棉花产量和品质;氮素的快速累积起始日较生物量早13d左右.在种植密度为每公顷97500株、240kg.hm-2施氮量处理下,两个品种棉花的生物量和氮素动态累积模型的特征参数最为协调,皮棉产量最高,纤维品质最优,氮素利用效率最高.在东北特早熟棉区,较早的生物量和氮素快速累积及较高的累积速率有利于棉花较高产量的形成.
The cotton planting density (75000, 97500 and 120000 plants per hectare) and nitrogen application rate (0,240,480kg.hm-2) were set in Liaomian 19 and Mianbian 33B respectively in 2008, ) Were used to study the effects of nitrogen and planting density on cotton biomass, nitrogen accumulation characteristics and nitrogen accumulation and utilization efficiency in especially precocious cotton region of Northeast China.The results showed that the cotton biomass and nitrogen accumulation of cotton and cotton The dynamic changes of fertility process all accorded with Logistic model. The planting density and nitrogen application rate significantly affected the dynamic characteristics of nitrogen accumulation and cotton yield and quality. The rapid onset of nitrogen accumulation was about 13 days earlier than that of biomass. Under the nitrogen application rate of 97500 hectare and 240kg.hm-2, the characteristics of biomass and nitrogen accumulation model of cotton were the best, the highest lint yield, the best fiber quality and the highest nitrogen use efficiency. The early precocious cotton area in Northeast China, the earlier accumulation of biomass and nitrogen and the higher accumulation rate are conducive to the formation of higher cotton yield.