基于DSSAT模型的新疆膜下滴灌花生灌溉施氮指标优化OA

[Objective]Water scarcity and inefficient nitrogen utilization are key constraints to agricultural production in Xinjiang.Using field experiments and numerical modelling,this paper investigates the optimal irrigation and nitrogen application rates for peanut production under mulched drip irrigation in Xinjiang.[Method]The experiment was conducted from 2022 to 2023 in a peanut field.It consisted of three irrigation treatments:22.5,30 and 37.5 mm in 2022,and 30,37.5 and 45 mm in 2023.Each irrigation treatment had two fertilization treatments:applying 45 and 90 kg N/hm2 in 2022,and 59 and 118 kg N/hm2 in 2023,with the no nitrogen fertilization treatment taken as the control.The experimental results were used to calibrated and validate the CSM-CROPGRO-Peanut model;the validated model was applied to elucidate how changes in irrigation and nitrogen fertilization affect crop growth,yield formation and water consumption.[Result]The model accurately simulated phenology,pod yield,biomass and leaf area index of the crop,with an average absolute relative error(ARE)less than 15%,meeting the requirements for field-scale simulation.Irrigation influenced peanut growth and yield more than nitrogen application.With increasing irrigation amount,water consumption,pod yield and both water and nitrogen use efficiency increased,while the nitrogen and water use efficiency plateaued and declined when irrigation exceeded 436.5 mm.[Conclusion]Considering yield,water and nitrogen use efficiency,and seed quality,entropy weight-TOPSIS analysis showed that the optimal irrigation and nitrogen combination for peanut production under mulched drip irrigation in Xinjiang is irrigating 436.5-490.5 mm of water and applying 90-120 kg/hm2 of nitrogen.This can be used as a reference for optimal water and nitrogen management in peanut cultivation in arid regions similar to Xinjiang.