Implementing water and nitrogen regulation is an effective approach to enhance the water use efficiency and yield of maize cultivated for seed production in arid regions.The experiment set four irrigation levels at 3900(W1),4200(W2),4800(W3),5400 m3·hm-2(W4)and four nitrogen fertilization levels at 0(F0),480(F1),540(F2),620 kg·hm-2(F3).The study analyzed changes in maize yield,yield components,water use efficiency,and dry matter accumulation and distribution.The results showed that:(1)With an irrigation quota of 4800 m3·hm-2 and top-dressed nitrogen fertilizer at 540 kg·hm-2,the yield and water use effi-ciency of maize increased by 9.7%and 22%respectively,compared to the local conventional irrigation and fertilization treatment.This led to water savings of 12.5%,nitrogen fertilizer savings of 14.8%,and an increase in irrigation water use efficiency by 23.4%.(2)The leaf distribution coefficient of maize showed a decreasing trend with the progression of the growth period.The stem distribution coefficient first increased and then decreased,peaking at the large bell mouth stage,with an overall deviation range of 0.574～0.588.The panicle distribution coefficient gradually increased,and the single-factor effects of water and nitrogen had no significant impact on the dry matter distribution coefficients.(3)A comprehensive analysis using the membership function indicated that the W3F2 treat-ment had the highest overall ranking.Therefore,an irrigation quota of 4800 m3·hm-2 and a top-dressed nitrogen fertilizer at 540 kg·hm-2 can promote the growth of maize,facilitate the transfer of dry matter to grains,improve grain quality,and achieve the goals of water conservation,high yield,and fertilizer conservation.This is the optimal water and nitrogen supply treatment for maize cultivation in the Fenglehe Irrigation District.
maize cultivationwater and nitrogen supplyyieldqualitywater use efficiencydry matter
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