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利用~(15)N技术在灌溉条件下研究施氮水下(75,150,225kg/hm~2)对冬小麦产量、氮素利用和土壤残留态无机态氮及其有效性的影响。结果表明:75kg/hm~2和150kg/hm~2施氮处理的冬小麦获得最高产量,二者没有显著性差异;而225kg/hm~2处理的冬小麦因过量施氮造成籽粒产量下降,并低于不施氮处理。植株对氮素的利用率随施氮水平的增加而下降,分别为38.5％,32.3％和22.4％。作物收获后发现,225kg/hm~2处理中所施氮的46％仍
The effect of applying nitrogen fertilizer (75,150,225 kg / hm ~ 2) on the yield, NUE and residual N status of winter wheat and its availability under irrigation was studied using ~ (15) N technique. The results showed that the highest yield of winter wheat with 75 kg / hm ~ 2 and 150 kg / hm ~ 2 nitrogen treatment was obtained, and no significant difference was found between the two treatments. However, the yield of 225 kg / hm ~ No nitrogen treatment. Nitrogen utilization rate decreased with the increase of N application rate, which was 38.5%, 32.3% and 22.4% respectively. After harvest, it was found that 46% of nitrogen applied in the 225 kg / hm ~ 2 treatment remained