基于全信息模型的膜下滴灌甜菜水氮供应指标优化

Water and nitrogen supply index optimization of sugar beets(Beta vulgaris L.)with drip irrigation under plastic mulch based on full information model

采用膜下滴灌节水栽培模式,通过建立甜菜水、氮供应与产质量回归模型,并采用模拟寻优的方法,研究了甜菜水氮耦合产质量达到最优时的适宜施氮量和灌水量.结果表明:甜菜产量与灌水量、施氮量的回归模型为Y=-0.127N×N+44.356N-0.004N×W+10.797W-0.004W×W,采用模拟寻优方法得出最佳灌水量和施氮量分别为1193.59~1227.5 m^(3)/hm^(2)和162.09~167.58 kg/hm^(2);含糖率与灌水量、施氮量的回归模型为Y=17.17-7.48×10^(-6)N×N+1.91×10^(-3)N-1.65×10^(-6)N×W-1.19×10^(-3)W-4.1×10^(-7)W×W,最适灌水量和施氮量分别为535.33~555.08 m^(3)/hm^(2)和133.07~145.06 kg/hm^(2);产糖量与灌水量和施氮量的回归模型为Y=-0.028N×N+10.058N-0.002N×W+1.336W-0.0005W×W,适宜灌水量和施氮量分别为1045.69~1084.11 m^(3)/hm^(2)和153.12~158.21 kg/hm^(2).

Water-saving cultivation pattern with drip irrigation under plastic mulch was used in the experiment to study the effect of water and nitrogen coupling on yield and quality of sugar beet.The regression model for the yield and the nitrogen application amount and the irrigation volume was Y=-0.127N×N+44.356N-0.004N×W+10.797W-0.004W×W.According to the simulated optimization method,the optimal irrigation volume and nitrogen supply amount were 1193.59~1227.5 m^(3)/hm^(2)and 162.09~167.58 kg/hm^(2)respectively.The regression model for sugar content and nitrogen supply amount and irrigation volume was Y=17.17-7.48×10^(-6)N×N+1.91×10^(-3) N-1.65×10^(-6) N×W-1.19×10^(-3) W-4.1×10^(-7) W×W.The optimum irrigation volume and nitrogen application amount were 535.33~555.08 m^(3)/hm^(2)and 133.07~145.06 kg/hm^(2)respectively.The regression model for the sugar yield and the amount of water and nitrogen was Y=-0.028N×N+10.058N-0.002N×W+1.336W-0.0005W×W.The suitable amount of irrigation water and nitrogen application were 1045.69~1084.11 m^(3)/hm^(2)and 153.12~158.21 kg/hm^(2)respectively.