膜下滴灌不同灌水下限对花生生长发育的影响及DMA数字模型构建OACSTPCD

Exploring the optimal irrigation system for peanut under film drip irrigation in the western region of Liaoning,establis-hing dynamic models for peanut dry matter accumulation at different irrigation thresholds with effective accumulated temperature as the independent variable,in order to provide reference for achieving high yield,water-saving,and efficient cultivation manage-ment of peanuts.Using peanut'Baisha 1016'as the experimental material in a field experiment,four irrigation treatments,rain fed treatment(CK),W50,W60,and W70(irrigation lower limits are 50%,60%,and 70%of the field water holding capacity,respectively)were set up.By observing changes in peanut plant height,LAI,and dry matter accumulation(DMA),the impact of different irrigation lower limits on peanut growth and development was analyzed,and a peanut growth dynamic model based on effective accumulated temperature as the independent variable and DMA as the dependent variable was established.The results showed that the growth rate of peanuts was faster during the flowering and podding stages,with a higher sensitivity to water.The growth rate in the later stages of growth was slower.The W70 treatment significantly improved the plant height,LAI,and DMA of peanuts compared to other treatments,with a maximum yield of 5 181.81 kg/hm2 and a maximum water use efficiency of 1.79 kg/m3.So the field water holding rate of 70%is the most suitable irrigation amount for peanuts under film drip irrigation condi-tions in this area,and a Gompertz equation based on normalized effective accumulated temperature as the independent variable for relative DMA prediction was established:y=0.9837e-exp(3.2309-12.7429x).