甘肃农业科技Issue(6)：6-9,4.DOI:10.3969/j.issn.1001-1463.2014.06.002
露地栽培条件下大白菜氮肥投入阈值研究
Study on Nitrogen Threshold of Chinese Cabbage in Open Field
摘要
Abstract
In order to provide evidence for reasonable use of nitrogen fertilizer,a field trial was carried out to examine the effects of the yield and the environmental effects of the chinese cabbage under open field cultivation during 2011-2012 . The results showed that the yield of chinese cabbage was highest at 656.4 kg/hm2 (N 300 kg/hm2+organic manure 12 000 kg/hm2). The nitrogen uptake by chinese cabbage increased with increasing N rate. With N application of 656.4 kg/hm2(N 300 kg/hm2+organic manure 12 000 kg/hm2), the nitrogen uptaked was the highest . With N fertilizer rate increasing,the content of NO3--N in soil layers increased dramatically . With more than 656.4 kg/hm2 (N 300 kg/hm2+organic manure 12 000 kg/hm2)was supplied,soil NO3--N moved down obviously. N fertilizer residual amount increased with increased N fertilizer rate. The nitrogen use efficiency ranged from 3.3%to 12.6%under different rates of N fertilization . At the rate of 656.4 kgN/hm2 (N 300 kg/hm2+organic manure 12 000 kg/hm2)could meet the chinese cabbage demand. These results suggest that the N application rates of 656.4 kg/hm2 (N 300 kg/hm2+organic manure 12 000 kg/hm2),would be optimal for the yield of chinese cabbage and a reduction in the risk of nitrate release into environment .关键词
投入阈值/氮肥利用率/大白菜/露地栽培Key words
Threshold/Nitrogen use efficiency/Chinese cabbage/Open field cultivation分类
农业科技引用本文复制引用
连彩云,马忠明..露地栽培条件下大白菜氮肥投入阈值研究[J].甘肃农业科技,2014,(6):6-9,4.基金项目
公益性行业（农业）科研专项“北方高原山地区面源污染监测与氮磷化肥投入阈值研究”（201003014-7）部分内容 （）
