干旱地区农业研究2026，Vol.44Issue(2)：104-114,201,12.DOI:10.7606/j.issn.1000-7601.2026.02.10
限量补灌与追氮对陕北糜子干物质及氮素积累转运的影响
Effects of limited supplementary irrigation and nitrogen topdressing on dry matter and nitrogen accumulation and translocation in broomcorn millet in Northern Shaanxi
摘要
Abstract
Taking'Yumei 2'as the experimental material,supplementary irrigation and fertilization were car-ried out at the booting and the filling stage of the broomcorn millet.Three total nitrogen application levels(N1:200 kg·hm-2,N2:150 kg·hm-2,N3:100 kg·hm-2)and three supplementary irrigation water levels(W1:30 mm,W2:22.5 mm,W3:15 mm)were set up to study the effects of limited supplementary irrigation and nitrogen application at key growth stages on the growth characteristics,dry matter pre-flowering translocation and post-flow-ering accumulation,water and nitrogen use efficiency,and yield of broomcorn millet.The results showed that ap-propriate water and nitrogen supply impacts broomcorn millet growth.The leaf area index of N1W1 treatment in-creased by 6.00％-68.35％at heading stage,and the crop growth rate and photosynthetic potential from heading and flowering stage to filling stage increased by 4.08％-64.58％and 6.12％-64.18％,respectively.The application rate of nitrogen and irrigation water significantly affected the dry matter and nitrogen accumulation and translocation of broomcorni millet(P＜0.05).The N1W1 treatment increased dry matter accumulation during maturity,pre-flow-ering translocation,and post-flowering accumulation by 5.94％-40.12％,11.96％-102.83％,and 1.00％-25.87％,respectively.Nitrogen pre-flowering translocation and post-flowering accumulation increased by 7.93％-103.75％and 3.89％-41.52％,respectively.Post-flowering dry matter and nitrogen accumulation contributed 73.21％-81.49％and 65.95％-73.6％to grain yield,respectively,both significantly higher than the pre-flowering transport contribution rate.When the application rate of nitrogen reached 150 kg·hm-2,the dry matter accumula-tion in grains,the pre-flowering translocation rate and the post-flowering accumulation of dry matter would no longer increase significantly.The pre-flowering translocation and post-flowering accumulation of dry matter and nitrogen were significantly positively correlated with grain yield,and the correlation coefficient between post-flowering dry matter accumulation and grain yield was the highest(R2=0.98).Grain yield increased with the increase of nitrogen application rate and irrigation water,with the N1W1 treatment yielding the highest(at 7 139.69 kg·hm-2),show-ing no significant difference from the N2W1 treatment.Water use efficiency peaked under the N1W1 and N2W1 treatments.The partial factor productivity of nitrogen decreased by 20.68％-79.27％with the increase of nitrogen application but increased by 5.31％-25.95％with the increase of irrigation water.The N2W1 treatment exhibited relatively high nitrogen fertilizer partial productivity.Therefore,based on the conditions of this experiment,consid-ering the water and nitrogen use efficiency and reducing nitrogen input,the N2W1 treatment(total nitrogen appli-cation:150 kg·hm-2,supplementary irrigation:30 mm)is more suitable as a supplementary irrigation and fertili-zation model to increase the yield of broomcorn millet in northern Shaanxi.关键词
糜子/限量补灌/追施氮肥/干物质积累/氮素转运/产量/陕北Key words
broomcorn millet/limited supplementary irrigation/nitrogen topdressing/dry matter accumulation/nitrogen transport/yield/northern Shaanxi分类
农业科技引用本文复制引用
沈佳琪,曹红霞,刘宁宁,任利宇,陈越浦,刘家璇,李志军..限量补灌与追氮对陕北糜子干物质及氮素积累转运的影响[J].干旱地区农业研究,2026,44(2):104-114,201,12.基金项目
陕西省重点产业创新链-农业领域项目(2023-ZDLNY-46) （2023-ZDLNY-46）
陕西省科技厅重点研发项目(2024NC-YBXM-025) （2024NC-YBXM-025）
