Optimization of maize water and nitrogen under the condition of integrated water and fertilizer in the irrigation area along the Yellow River
To further enhance water and nitrogen use efficiency in the irrigation areas on the southern bank of the Yellow River and achieve the goal of significant water and fertilizer conservation in farmland,an experiment on groundwater nitrogen control under drip irrigation was conducted in Garangtu Town,Hangjin Banner,Ordos City,in 2023.The study examined the effects of various water and nitrogen treatments on maize yield and water and nitro-gen use efficiency under drip irrigation,with the aim of optimizing the water and nitrogen application rates.The re-sults showed under the medium nitrogen treatment the yield of maize increased by 23.3％,the water use efficiency increased by 7.14％,and the partial productivity of nitrogen fertilizer decreased by 18.3％when compared with low nitrogen treatment.When comparing with the high nitrogen treatment,the medium nitrogen treatment,the yield of maize increased by 2.8％,and the water use efficiency increased by 7.7％,and the partial productivity of nitrogen fertilizer increased by 38.1％.Under the same fertilization condition,the yield,water use efficiency and nitrogen partial productivity of maize under middle water treatment increased by 37.1％,26.1％and 16.6％when compared with low water treatment.The yield increased by 12.8％,water use efficiency and nitrogen partial productivity in-creased by 38.3％and 12.9％under the higher water treatment.Three sets of regression models were established be-tween irrigation amount,nitrogen application amount,corn yield,water use efficiency and nitrogen partial produc-tivity.Through optimization,three sets of water and nitrogen intervals were obtained,and their intersection was taken.The optimal interval of total water and nitrogen use in the growing period was 1 800～2 046 m3·hm-2 and 210～249.2 kg·hm-2,which both met high yield and high water and nitrogen use efficiency.The water and nitro-gen production function based on Jensen model was used to allocate the optimal range of total water and nitrogen consumption in each growth period,and the water and nitrogen system in each growth period under drip irrigation was rationally allocated.The research results can provide reference for water and fertilizer management models and plans for maize planting in the irrigation area along the southern bank of the Yellow River.
water and nitrogen optimizationwater and nitrogen production functiondrip irrigation and fertili-zationirrigation district along the Yellow river
万方数据
维普
