【摘要】 以鄂杂棉29为材料,研究了不同密度和施氮量对麦后直播棉产量及其结构的影响。结果表明:在同一施氮量条件下,随着密度的增加,株高、总果节、单铃重、单株成铃数、成铃率下降,现蕾果节位升高,群体总铃数增加,伏桃比例上升。在施氮量225 kg/hm2条件下产量随密度增加而增加;施氮量300kg/hm2条件下,产量先随密度增加而增加,达一定密度后产量反而下降。施氮量225 kg/hm2条件下以60000株/hm2产量最高,施氮量300 kg/hm2条件下以52 500株/hm2的产量最高。更多还原

【Abstract】 Field experiment was conducted to study the effects of density and nitrogen application dose on yield and yield components of direct seeding cotton after wheat harvest using Ezamian No.29 as material.The result showed that plant height,total fruit sites,single boll weight,boll number per plant,and boll setting percentage decreased with the increase of density,while flower bud branches,total bolls per hectare,rate of bolls formed in summer and autumn increased.The cotton yield increased with the increase of density when the dose of nitrogen was 225 kg/hm2.However,there was a parabolic relationship between cotton yield and the density when the nitrogen dose was 300 kg/hm2.The highest yield at nitrogen application dose 225 kg/hm2 was obtained when the density was 60 000 ind/hm2;while at nitrogen application dose 300 kg/hm2,the highest yield was obtained when the density was 52 500 ind/hm2.更多还原