Pedosphere 16(2): 224--229, 2006
ISSN 1002-0160/CN 32-1315/P
©2006 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effect of long-term fertilization on organic nitrogen forms in a calcareous alluvial soil on the North China Plain |
JU Xiao-Tang1 , LIU Xue-Jun1, ZHANG Fu-Suo1 and P. CHRISTIE1,2 |
1 Key Laboratory of Plant-Soil Interactions, Ministry of Education, College of Agricultural Resources and Environmental Sciences, China Agricultural University, Beijing 100094 (China). E-mail: juxt@cau.edu.cn
2 Agricultural and Environmental Science Department, The Queen's University of Belfast, Belfast BT9 5PX (UK) |
| ABSTRACT |
| In order to illustrate the change of nitrogen (N) supply capacity after long-term application of manure and chemical fertilizer, as well as to properly manage soil fertility through fertilizer application under the soil-climatic conditions of the North China Plain, organic N forms were quantified in the topsoil with different manure and chemical fertilizer treatments in a 15-year fertilizer experiment in a Chinese calcareous alluvial soil. Soil total N (TN) and various organic N forms were significantly influenced by long-term application of chemical fertilizer and manure. TN, total hydrolysable N, acid-insoluble N, amino acid N and ammonium N in the soil increased significantly (P < 0.05) with increasing manure and fertilizer N rates, but were not influenced by increasing P rates. Also, application of manure or N fertilizer or P fertilizer did not significantly influence either the quantity of amino sugar N or its proportion of TN. Application of manure significantly increased (P < 0.05) hydrolysable unknown N, but adding N or P did not. In addition, application of manure or N fertilizer or P fertilizer did not significantly influence the proportions of different soil organic N forms. |
| Key Words: chemical fertilizer, long-term fertilization, manure, North China Plain, soil organic nitrogen forms |
| Citation: Ju, X. T., Liu, X. J., Zhang, F. S. and Christie, P. 2006. Effect of long-term fertilization on organic nitrogen forms in a calcareous alluvial soil on the North China Plain. Pedosphere. 16(2): 224-229. |
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