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氮肥用量及施用时间对土体中硝态氮移动的影响
引用本文:张树兰,同延安,梁东丽,吕殿青,OveEmteryd.氮肥用量及施用时间对土体中硝态氮移动的影响[J].土壤学报,2004,41(2):270-277.
作者姓名:张树兰  同延安  梁东丽  吕殿青  OveEmteryd
作者单位:1. 西北农林科技大学资源环境学院,陕西,杨凌,712100
2. 瑞典农业大学
摘    要:土连续两年小麦—玉米轮作条件下 ,播前一次施氮量 130~ 5 2 0kghm-2 a-1时 ,氮肥用量对硝态氮在土体中的移动深度没有影响 ,但土壤剖面中残留的硝态氮量随施氮量增加显著增加。播前一次施用氮肥 ,差减法计算的肥料氮表观回收率 (作物携出量和土壤硝态氮的残留量 )为 6 2 %~ 82 7% ;就作物而言小麦的携出率高于玉米 ,在玉米生长季节有更多的硝态氮可能被淋移至土壤剖面的下层。小麦—玉米轮作一年 ,不同的施氮时间对肥料氮的表观回收率以及硝态氮在土壤剖面中的分布、累计没有明显影响。土区合适的氮肥用量是控制硝态氮向深层移动的主要措施

关 键 词:氮肥用量  施氮时间  硝态氮运移  小麦—玉米轮作
收稿时间:1/9/2003 12:00:00 AM
修稿时间:2003/9/15 0:00:00

NITRATE-N MOVEMENT IN THE SOIL PROFILE AS INFLUENCED BY RATE AND TIMING OF NITROGEN APPLICATION
Zhang Shulan,Tong Yanan,Liang Dongli,L&#; Dianqing and Emteryd Ove.NITRATE-N MOVEMENT IN THE SOIL PROFILE AS INFLUENCED BY RATE AND TIMING OF NITROGEN APPLICATION[J].Acta Pedologica Sinica,2004,41(2):270-277.
Authors:Zhang Shulan  Tong Yanan  Liang Dongli  L&#; Dianqing and Emteryd Ove
Institution:Zhang Shulan 1 Tong Yanan 1 Liang Dongli 1 Lu Dianqing 1 Emteryd Ove 2
Abstract:Nitrogen fertilizer is a potential contaminant of ground water. The purpose of this study was to determine influ ence of rate and timing of N fertilizer application on N movement in the soil during the crop growing season. Wheat and maize were grown alternately at Yangling, Shaanxi Province from Oct., 1994 to Oct., 1996. An experiment was conducted on effect of N application rate on N movement in cumulic cinnamon soil using urea with four rates that ranged from N 130~520 kg hm-2 a-1 and an experiment on effect of timing of N application on the same soil with three rates and four timings from Oct., 1994 to Oct., 1995. The two experiments were laid out in a randomized complete block with three replications. After each crop harvest, the soil was sampled to a depth of 400 cm and analyzed for nitrate nitrogen. Nitrogen rate had no influence on nitrate N movement in the soil after two years, but NO3--N had moved down beyond 200 cm in treatments with N rate higher than 130 kg hm-2 a-1. N rate increased NO3--N accumulation in the soil. The total recovery of N ranged from 62% to 82.7%, higher with wheat than with maize. Timing of application did not influence N fertilizer movement and N recovery, either. It was found that for irrigated wheat-maize rotation system in the region, most of the N recovered came from the top 200 cm of soil, regardless of N fertilizer practices.
Keywords:N rate  Timing of application  NO 3  --N movement  Wheat  maize rotation
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