2006•Zhongguo shengtai nongye xuebaoRequires access

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

Ma Zong, Xie De

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%.

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Key concepts: Lint, Photosynthesis, Potash, Yield (engineering), Seeding, Agronomy, Stomatal conductance, Potassium