| Effect of Incorporation of Wheat Straw and Urea into Soil on Biomass Nitrogen and Nitrogen-Supplying Characteristics of Paddy Soil |
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| 作者姓名： | SHEN QI-RONG XU SHOU-MING SHI RUI-HE |
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| 作者单位： | [1]DepartmentofSoilScienceandAgrochemistry,NanjingAgriculturalUniversity,Nanjing210014（China） [2]NantongIns,NanjingAgriculturalUniversity,Nanjing210014（China） |
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| 摘 要： | Pot experiments were carried out to study the effect of incorporation of wheat straw and/ or urea into soil on biomass nitrogen and mineral nitrogen and its relation to the growth and yield of rice.The combined appliation of wheat straw and urea increased much more biomass nitrogen in soil than the application of wheat straw or urea alone and consequently increased the immobilization of urea nitrogen added and reduced the loss of urea nitrogen.An adequate nitrogen-supplying process to rice plant could be obtained if C/ N ratio of the material added was about 20.The three yield components of rice were affected significantly by the status of nitrogen supplying.More than 30mg N/ kg soil of mineral nitrogen at effective tillering stage,panicle initiation stage and filling stage should be maintained in order to get high rice yield,though the criteria varied with the different experimental conditions.
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| 关 键 词： | 水稻土 尿素 小麦秸秆 有机氮 无机氮 混合施肥 |
Effect of Incorporation of Wheat Straw and Urea into Soil on Biomass Nitrogen and Nitrogen-Supplying Characteristics of Paddy Soil |
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| SHEN QI-RONG,XU SHOU-MING,SHI RUI-HE.Effect of Incorporation of Wheat Straw and Urea into Soil on Biomass Nitrogen and Nitrogen-Supplying Characteristics of Paddy Soil[J].Pedosphere,1993,3(3):201-205. |
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| Authors: | SHEN QI-RONG XU SHOU-MING and SHI RUI-HE |
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| Institution: | Department of Soil Science and Agrochemistry, Nanjing Agricultural University, Nanjing 210014;Department of Soil Science and Agrochemistry, Nanjing Agricultural University, Nanjing 210014;Department of Soil Science and Agrochemistry, Nanjing Agricultural University, Nanjing 210014 |
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| Abstract: | Pot experiments were carried out to study the effect of incorporation of wheat straw and/ or urea into soil on biomass nitrogen and mineral nitrogen and its relation to the growth and yield of rice.The combined appliation of wheat straw and urea increased much more biomass nitrogen in soil than the application of wheat straw or urea alone and consequently increased the immobilization of urea nitrogen added and reduced the loss of urea nitrogen.An adequate nitrogen-supplying process to rice plant could be obtained if C/ N ratio of the material added was about 20.The three yield components of rice were affected significantly by the status of nitrogen supplying.More than 30mg N/ kg soil of mineral nitrogen at effective tillering stage,panicle initiation stage and filling stage should be maintained in order to get high rice yield,though the criteria varied with the different experimental conditions. |
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