| 太湖水稻土麦季尿素氨挥发损失 |
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| 作者姓名： | FAN Xiao-Hui SONG Yong-Sheng LIN De-Xi YANG Lin-Zhang ZHOU Jian-Min |
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| 作者单位： | InstituteofSoilScience,ChineseAcademyofSciences,Nanjing210008China |
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| 基金项目： | *1Project supported by the Knowledge Innovation Program of Chinese Academy of Sciences (No.KZCX2-413-3), the National Key Basic Research Support Foundation of China (No.G1999011802) and the National Natural Science Foundation of China (No.30390080). |
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| 摘 要： | Ammonia volatilization losses from urea applied as a basal fertilizer and a top dressing at tillering stage in a wheat field of Taihu Region, China, were measured with a micrometeorological technique. Urea as fertilizer was surface broadcast at 81 (low N) and 135 (high N) kg N ha-1 as basal at the 3-leaf stage of the wheat seedling on December 2002, and 54 (low N) and 90 (high N) kg N ha-1 as top dressing on February 2003. Ammonia volatilization losses occurred mainly in the first week after applying N fertilizer and mainly during the period after basal fertilizer application, which accounted for more than 80% of the total ammonia volatilization over the entire wheat growth period. Regression analysis showed that ammonia volatilization was affected mainly by pH and NH4^ -N concentration of the surface soil and air temperature.Ammonia volatilization flux was significantly correlated with pH and NH4^ -N concentration of the surface soil and with daily air average temperature and highest temperature. Thus, application of urea N fertilizer to wheat should consider the characteristics of ammonia volatilization in different periods of N application so as to reduce ammonia losses.
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| 关 键 词： | 氨挥发 尿素 小麦 栽培管理 施肥方法 |
Ammonia volatilization losses from urea applied to wheat on a paddy soil in Taihu Region, China |
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| FAN Xiao-Hui,SONG Yong-Sheng,LIN De-Xi,YANG Lin-Zhang,ZHOU Jian-Min.Ammonia volatilization losses from urea applied to wheat on a paddy soil in Taihu Region, China[J].Pedosphere,2005,15(1):59-65. |
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| Authors: | FAN Xiao-Hui SONG Yong-Sheng LIN De-Xi YANG Lin-Zhang and ZHOU Jian-Min |
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| Institution: | InstituteofSoilScience,ChineseAcademyofSciences,Nanjing210008China |
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| Abstract: | Ammonia volatilization losses from urea applied as a basal fertilizer and a top dressing at tillering stage in a wheat field of Taihu Region, China, were measured with a micrometeorological technique. Urea as fertilizer was surface broadcast at 81 (low N) and 135 (high N) kg N ha-1 as basal at the 3-leaf stage of the wheat seedling on December 2002, and 54 (low N) and 90 (high N) kg N ha-1 as top dressing on February 2003. Ammonia volatilization losses occurred mainly in the first week after applying N fertilizer and mainly during the period after basal fertilizer application, which accounted for more than 80% of the total ammonia volatilization over the entire wheat growth period. Regression analysis showed that ammonia volatilization was affected mainly by pH and NH4^ -N concentration of the surface soil and air temperature.Ammonia volatilization flux was significantly correlated with pH and NH4^ -N concentration of the surface soil and with daily air average temperature and highest temperature. Thus, application of urea N fertilizer to wheat should consider the characteristics of ammonia volatilization in different periods of N application so as to reduce ammonia losses. |
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| Keywords: | ammonia volatilization urea wheat |
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