【摘要】 研究了大田条件下3个N、P、K施肥水平配合2个缩节胺(DPC)用量对麦后直播夏棉光合特性及产量的影响。结果表明,尿素225kg/hm2、过磷酸钙450kg/hm2和氯化钾150kg/hm2配合喷施DPC90g/hm2,有利于提高夏棉叶片PSⅡ最大光能转换效率(Fv/Fm)、PSⅡ活性(Fv/Fo)、光合效率(Pn)和气孔导度(Gs),棉花群体光合速率(CAP)高,单株结铃多,优质铃增加,铃重大,比其他处理皮棉增产17.4%～33.9%。更多还原

【Abstract】 Effects of three levels of N,P,K fertilizer application combined with two DPC spraying quantity on photosynthesis property and yield of cotton directly seeded after wheat were studied under a field condition.The results show that applying urea(225kg/hm2),superphosphate(450kg/hm2),potassium chloride(150kg/hm2)and spraying DPC(90 g/hm2)can improve the maximal PSⅡ light energy transformation efficiency(F_v/F_m),PSⅡ activity(F_v/F_o),photosynthesis rate(Pn)and stomatal conductance(Gs)of leaves of cotton,and increase the canopy photosynthesis rate(CAP),bolls per plant,high-quality bolls and bolls weight of cotton.Compared with other treatments,lint yield is increased by 17.4%～33.9%.更多还原