干旱地区农业研究2018，Vol.36Issue(3)：156-160,5.DOI:10.7606/j.issn.1000-7601.2018.03.24
施氮量对滴灌超高产春玉米根系时空分布及产量的影响
Effects of nitrogen application rate on temporal and spatial distribution characteristics of super-high yield spring maize root and yield under drip irrigation
摘要
Abstract
To explore the effect of different nitrogen fertilizer on root distribution law of super-high-yield spring maize under drip irrigation.Five nitrogen levels(0,150,300,375,450 kg·hm-2)were used in the experiment to investigate the effect of root growth in 60 cm soil depth and yield of Spring Maize by soil profile sampling method.The results showed that,root dry weight and root length of super-high-yield spring maize were mainly concentrated in the 0～20 cm soil layer,and decreased after the first increase in the whole growth period,while the maximum was reached at the silking stage.Dry weight density and root length density of each layer significantly increased with ni-trogen increase.Applying nitrogen can delay root senescence of Spring Maize in different soil layers significantly during booting with silking stage,especially the root activity increased significantly during grain filling period in 20～60 cm soil layer.When the amount of nitrogen fertilizer was 300 kg·hm-2,the root growth of spring maize was better,and the agronomic efficiency was up to 13.8 kg·kg-1,meanwhile,the grain yield was 17 117 kg·hm-2,and the yield increased by 32.10％.When we continued to increase the amount of nitrogen fertilizer,the yield in-crease was not significant,and the root trait of each soil parameter showed a decrease trend of change.Comprehen-sive consideration,the suitable nitrogen amount would be 300 kg·hm-2at booting and silking stage,so that high yield can be achieved.关键词
施氮量/春玉米/根系/时空分布/产量Key words
nitrogen rate/spring maize/root system/temporal and spatial distribution/yield分类
农业科技引用本文复制引用
楚光红,章建新,高阳,傅积海,唐长青,王娜..施氮量对滴灌超高产春玉米根系时空分布及产量的影响[J].干旱地区农业研究,2018,36(3):156-160,5.基金项目
国家自然科学基金(31160266) （31160266）
