干旱地区农业研究2017，Vol.35Issue(2)：166-171,6.DOI:10.7606/j.issn.1000-7601.2017.02.26
缓释尿素对滴灌棉田土壤无机氮及其产量的影响
Effects of slow-release urea on soil inorganic N and yield in drip-irrigated cotton field
摘要
Abstract
The objective of this experiment was to study the effect of slow-release urea fertilizer on soil inorganic N distribution,N accumulation,residual N concentration,yield,N use efficiency,and the N balance.Findings from this study can be used to determine if slow-release urea can be applied to drip-irrigated cotton and to decide the optimum application rate at planting.The results showed that the concentration of NO3--N and NH4 +-N significantly increased by using slow-release urea,and the content of nitrate nitrogen in the soil treated with slow-release urea increased by 189.27％,195.58％ and 112.70％ respectively.The accumulation amount of inorganic nitrogen in the soil in fertilization treatment showed the enrichment phenomenon,and the negative accumulation effect was shown in the treatment of nitrogen fertilizer.The content of inorganic nitrogen in soil decreased with the increase of the proportion of base fertilizer,while the apparent N loss and the increase of the percentage of nitrogen surplus decreased first and then increased.Cotton yield,nitrogen use efficiency and agronomic efficiency increased first and then decreased with the increase in the proportion of base fertilizer of slow-release urea,and the yield was attributed to the increase in the boll number and boll weight of cotton.In conclusion,under the experimental conditions,with slow-release urea being 50％ of the total nitrogen,the yield of drip-irrigated cotton and nitrogen use efficiency were higher,and apparent N loss was lower.关键词
滴灌/棉田/缓释尿素/无机氮/产量Key words
drip irrigation/cotton field/slow-release urea/inorganic nitrogen/yield分类
农业科技引用本文复制引用
李玮,冶军,郑继亮,岳艳军..缓释尿素对滴灌棉田土壤无机氮及其产量的影响[J].干旱地区农业研究,2017,35(2):166-171,6.基金项目
国际科技合作专项(2015DFA11660) （2015DFA11660）
