Effects of water and nitrogen on growth,yield and water and nitrogen utilization efficiency of resown Maize and verification of scheme optimization model
[Objective]This project intends to formulate a reasonable combined application scheme of wa-ter and nitrogen,and verify the practicability of fuzzy comprehensive evaluation model based on analytic hierar-chy process in field crop scheme optimization.Aiming at the high-efficiency and high-yield planting of Maize in the arid area of southern Xinjiang.[Methods]Due to the arid climate,barren soil and low utilization rate of water and nitrogen in Xinjiang,the experiment of drip irrigation and fertilizer integration and joint regu-lation was carried out.Three horizontal gradients of irrigation water volume were set,which were 300 mm(W1),400 mm(W2)and 500 mm(W3)respectively;Three horizontal gradients of nitrogen application rate were set,which were 0 kg/hm2(F0),250 kg/hm2(F1)and 350 kg/hm2(F2),9 processes in total(W1F0、W1F1、W1F2、W2F0、W2F1、W2F2、W3F0、W3F1、W3F2).The effects of different water and nitrogen on plant height,leaf area index,dry matter accumulation,yield and water and nitrogen utilization efficiency of maize under drip irrigation were measured and analyzed.In addition,combined with conventional analysis and fuzzy comprehensive evaluation,the optimal water and nitrogen combined application scheme was sought and the model was verified.[Results]Under the appropriate amount of irrigation and nitrogen application,there was an obvious interaction between water and nitrogen,which could improve the plant height,leaf area index,dry matter accumulation and accumulation rate and yield of maize.The yield change was parabolic with the in-crease of nitrogen application and irrigation,and the yield increase efficiency decreased.Under the treatment of W2F1,the plant height,leaf area index,the dry matter accumulation did reach the maximum,the yield growth rate reached 24.35％,the water use efficiency reached the maximum value of 3.89 kg/m3,and the nitrogen use efficiency was second only to W3F1.[Conclusion]The optimal irrigation and nitrogen application rates of maize water-saving and fertilizer saving production in Aksu area of Xinjiang are 400 mm and 250 kg/hm2(W2F1).
repeat corndrip irrigationcombined application of water and nitrogenfuzzy comprehensive evaluationyieldwater and nitrogen utilization efficiency
国家科技期刊平台
NSTL
万方数据
