Construction and Evaluation of Cotton Yield Model Based on Logistic Model for Filmless Drip Irrigation in Southern Xinjiang
In order to elucidate the effects of irrigation on growth and yield formation of cotton with filmless drip irrigation,with a two-year field experiments from 2019 to 2020,the Logistic model was adopted to quantify the impactions of different irrigation treatments on dynamics of stem diameter,plant height,and leaf area index of drip-irrigated cotton without film mulching.The growth models were constructed for analyzing the regression relationship between the dynamics of cotton growth and yield and its components,and the cotton yield model also was constructed.The results indicated that the normalized root-mean-square errors(nRMSE)of the measured and simulated values of cotton stem diameter,plant height and leaf area index were all less than 20％,and synergy index(d)and coefficient of determination(R2)were higher than 0.91,suggesting that the Logistic model could accurately describe the growth dynamics of cotton stem diameter,plant height,and leaf area index under different drip irrigation treatments without film mulching.There were significant correlations between yield and maximum value of stem diameter,plant height,leaf area index and water consumption of drip-irrigated cotton without film mulching.The nRMSE,d and R2 of the predicted and measured values of the cotton yield model were 5.11％,0.88 and 0.62,respectively,and the yield model had high prediction accuracy.
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