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黄土旱塬黑垆土-冬小麦系统中尿素氮的去向及增产效果
引用本文:党廷辉,蔡贵信,郭胜利,郝明德,郭明航,王百群.黄土旱塬黑垆土-冬小麦系统中尿素氮的去向及增产效果[J].土壤学报,2002,39(2):199-205.
作者姓名:党廷辉  蔡贵信  郭胜利  郝明德  郭明航  王百群
作者单位:1. 中国科学院水利部水土保持研究所,杨凌,712100
2. 中国科学院南京土壤研究所,南京,210008
基金项目:国际原子能机构项目(CPR9986)、国家攻关项目(96-004-05)及中国科学院重大项目(KZ951-A1-301)和特别支持项目(KZ95T-04-01)资助
摘    要:在黄土高原南部旱塬区陕西省长武县的黑垆土上 ,用田间小区和15N微区试验研究了氮肥的增产效果 ,水分利用率以及尿素氮的去向。结果表明 ,氮肥的增产效果随氮肥用量增加而降低 ,施N量为 1 0 0和 1 5 0kghm- 2 时每kg肥料N分别增产小麦 1 2 .1kg和6.4kg。施用氮肥亦提高了水分利用率 ,无氮区和施肥区的水分利用率分别为 7.6kghm- 2 mm- 1和 9.7~ 1 0 .5kghm- 2 mm- 1。15N微区试验结果表明 ,尿素作基肥混施入耕层后 ,小麦利用率为36.6%~ 38.4% ,土壤残留率为 2 9.2 %~ 33.6% ,标记氮肥在土壤剖面中的残留率随土层深度的加深而迅速降低。小麦吸收的氮素来自肥料氮的比例在 33%~ 40 %之间 ,来自土壤氮素的比例在 60 %以上

关 键 词:尿素氮去向  冬小麦  黑垆土  增产效果  水分利用率
收稿时间:2000/7/10 0:00:00
修稿时间:2000年7月10日

FATE OF AND CROP RESPONSE TO NITROGEN APPLIED TO WINTER WHEAT GROWING ON HEILU SOIL
Dang Ting-hui,Cai Gui-xin,Guo Sheng-li,Hao Ming-de,Guo Ming-hang and Wang Bai-qun.FATE OF AND CROP RESPONSE TO NITROGEN APPLIED TO WINTER WHEAT GROWING ON HEILU SOIL[J].Acta Pedologica Sinica,2002,39(2):199-205.
Authors:Dang Ting-hui  Cai Gui-xin  Guo Sheng-li  Hao Ming-de  Guo Ming-hang and Wang Bai-qun
Institution:Dang Ting-hui 1\ Cai Gui-xin 2\ Guo Sheng-li 1 Hao Ming-de 1\ Guo Ming-hang 1\ Wang Bai-qun 1
Abstract:An experiment was conducted in a wheat field of Heilu soil in the south of the Loess Plateau, Changwu County, Shaanxi Province. Efficiencies of urea use and water use were studied in a plot field experiment. Meanwhile the fate of applied nitrogen was investigat ed with 15N isotope technique. Results showed that crop response to N applied at the rate of 100kg hm-2 was higher with productiv ity index of 12.1kg grain kg-1 N, than at the rate of 150kg hm-2 with productivity index of 6.4kg grain kg-1 N. Nitrogen application increased water use efficiency from 7.6kg hm-2 mm-1 to 9.7~10.5kg hm-2 mm-1. 15N study showed that plant recoveries were in the range of 36.6%~38.4%; N remaining in 0~40 cm soil ranged in 29.2%~33.6% and decreased rapidly with increasing soil depth. About 33%~40% of the N taken up by wheat was derived from the urea applied and the rest, around 2/3 derived from the soil.
Keywords:Fate of urea N  Winter wheat  Heilu soil  Productivity index  Water use efficiency
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