Nitrogen Cycling and Losses Under Rice-Wheat Rotations with Coated Urea and Urea in the Taihu Lake Region

WANG Xiao-Zhi; ZHU Jian-Guo; GAO Ren; H. YASUKAZU; FENG Ke

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Nitrogen Cycling and Losses Under Rice-Wheat Rotations with Coated Urea and Urea in the Taihu Lake Region

机译：太湖地区包膜尿素和尿素的稻麦轮作下氮素循环与损失。

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A lysimeter experiment with undisturbed soil profiles was carried out to study nitrogen cycling and losses in a paddy soil with applications of coated urea and urea under a rice-wheat rotation system in the Taihu Lake region from 2001 to 2003. Treatments for rice and wheat included urea at conventional, 300 (rice) and 250 (wheat) kg N ha-1, and reduced levels, 150 (rice) and 125 (wheat) kg N ha-1, coated urea at two levels, 100 (rice) and 75 (wheat) kg N ha-1, and 150(rice) and 125 (wheat) kg N ha-1, and a control with no nitrogen arranged in a completely randomized design. The results under two rice-wheat rotations showed that N losses through both NH3 volatilization and runoff in the coated urea treatments were much lower than those in the urea treatments. In the urea treatments N runoff losses were significantly (P ＜ 0.001) positively correlated (r = 0.851) with applied N. N concentration in surface water increased rapidly to maximum two days after urea application and then decreased quickly. However, if there was no heavy rain within five days of fertilizer application, the likelihood of N loss by runoff was not high. As the treatments showed little difference in N loss via percolation, nitrate N in the groundwater of the paddy fields was not directly related to N leaching. The total yieldof the two rice-wheat rotations in the treatment of coated urea at 50% conventional level was higher than that in the treatment of urea at the conventional level. Thus, coated urea was more favorable to rice production and environmental protection than urea.

机译：在2001年至2003年的太湖地区，通过稻麦轮作系统，在水稻-小麦轮作系统下，采用包衣尿素和尿素进行尿素测定，研究了土壤剖面不受干扰的渗漏试验，研究了氮素循环和损失。常规尿素为300（大米）和250（小麦）kg N ha-1，降低水平为150（大米）和125（小麦）kg N ha-1，包衣尿素为两个水平，分别为100（大米）和75 （小麦）kg N ha-1、150（大米）和125（小麦）kg N ha-1，以及完全随机设计的无氮对照。两次水稻-小麦轮作的结果表明，包膜尿素处理过程中由于NH3挥发和径流造成的氮损失远低于尿素处理过程。在尿素处理中，氮素径流损失与施氮量呈显着正相关（r <0.851）（P ＜0.001）。地表水中氮素的浓度在施用尿素后两天迅速增加至最大值，然后迅速减少。但是，如果在施肥的五天内没有大雨，径流造成氮素流失的可能性就不高。由于处理显示渗氮损失几乎没有差异，因此稻田地下水中的硝态氮与氮的淋溶没有直接关系。常规水平的包膜尿素处理两次稻麦轮作的总产量高于常规水平的尿素处理。因此，包膜尿素比尿素更有利于大米的生产和环境保护。

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来源
《土壤圈（英文版）》 |2007年第1期|62-69|共8页
作者
WANG Xiao-Zhi; ZHU Jian-Guo; GAO Ren; H. YASUKAZU; FENG Ke;
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作者单位

State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences,Nanjing 210008 (China);

Environment Science and Engineering College, Yangzhou University, Yangzhou 225009 (China);

State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences,Nanjing 210008 (China);

Fujian Normal University, Fuzhou 350007 (China);

Japan International Research Center for Agricultural Sciences, 1-2 Ohwashi, Tsukuba, Ibaraki 305-8686 (Japan);

Environment Science and Engineering College, Yangzhou University, Yangzhou 225009 (China);

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
原文格式 PDF
正文语种 chi
中图分类农业基础科学;
关键词
ammonia volatilization; coated urea; N cycling; percolation; runoff;

机译：氨挥发;包膜尿素;氮循环;渗滤;径流;

Nitrogen Cycling and Losses Under Rice-Wheat Rotations with Coated Urea and Urea in the Taihu Lake Region

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