[1]HU Zhong-ke,ZHUANG Wen-hua,LIU Chao,et al.Effect of Coupling of Water and Potassium on Rape Yield and Water Use Efficiency in Purple Soil Areas[J].Research of Soil and Water Conservation,2014,21(04):87-91.

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Effect of Coupling of Water and Potassium on Rape Yield and Water Use Efficiency in Purple Soil Areas

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 21 Number of periods: 2014 04 Page number: 87-91 Column: Public date: 2014-08-28

Title:: Effect of Coupling of Water and Potassium on Rape Yield and Water Use Efficiency in Purple Soil Areas

Author(s):: HU Zhong-ke¹, ZHUANG Wen-hua^1,2, LIU Chao¹, LIU Tie-gang¹, LI Zhuo²; 1. State Key Laboratory of Hydraulic and Mountain River Engineering, College of Hydraulic and Hydroelectric Engineering, Sichuan University, Chengdu 610065, China;
2. Key Laboratory of Water Saving Agriculture in Hill Areas in Southern China of Sichuan Province, Sichuan Academy of Agricultural Sciences, Chengdu 610066, China

Keywords:: rape; coupling of water and potassium; yield; water use efficiency; purple soil

CLC:: S274.1

DOI:: -

Abstract:: To seek for the appropriate amount of water and potassium under different decision objectives on rape in purple soil areas of Sichuan Basin, a model were established to examine the effect of different soil water contents(θ_f40%, 60%, 80%) on the yield and WUE of rape under different rates of potassium fertilizer(0, 0.33, 0.66 g/kg). Results showed that soil water contents at flowering stage had the greatest impact on yield, followed by vegetativing stage; the increase rate of production with increasing amount of water and potassium showed the decrease after increasing trend; both soil moisture and fertilizer have pronounced effects on the rape yield and WUE, the effect order of interaction was potassium and water coupling > soil moisture > potassium. Amounts for highest yield were 0.66 g/kg of potassium and θ_f80% of soil moisture at all stages, WUE was 14.6 kg/(hm²·mm). However, amounts of potassium and soil moisture for highest WUE were 0.66 g/kg, θ_f58.7%, respectively, at vegetativing stage, θ_f74.7% at flowering stage, but the yield lowered by roughly 19.7%. In consideration of the comprehensive performance of the yield, WUE and economic efficiency, the recommended coupling pattern of water and potassium in areas of seasonal drought and acidic purple soil was set as that potassium application rate was 0.57g/kg and soil moisture was θ_f68% at vegetativing stage, soil moisture was θ_f80% at flowering stage.

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