施肥与缩节胺配合对麦后直播夏棉光合特性及产量的影响

Effects of different fertilizer application combined with different DPC quantities on photosynthesis property and yield of cotton directly seeded after wheat

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DPC 90g/hm ²，有利于提高夏棉叶片PSⅡ最大光能转换效率(F_v/F_m)、PSⅡ活性(F_v/F_o)、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%。

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(90g/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%.