Pedosphere 15(3): 369--378, 2005
ISSN 1002-0160/CN 32-1315/P
©2005 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Chemical and microbiological parameters of paddy soil quality as affected by different nutrient and water regimes |
YANG Chang-Ming 1,2, YANG Lin-Zhang1 and YAN Ting-Mei1 |
1 Institute of Soil Science, Chinese Academy of Sciences, P. O. Box 821, Nanjing 210008 (China). E-mail: cmyang@mail.tongji.edu.cn
2 State Key Lab. of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092 (China) |
| ABSTRACT |
| A field experiment was conducted from 1999 to 2002 to compare and evaluate the effects of nutrient and water regimes on paddy soil quality by investigating soil chemical and microbiological parameters. Four nutrient regimes, a control, chemical fertilizers only (CF), chemical fertilizers with swine manure (SM), and chemical fertilizers with wheat straw (WS), and two soil moisture regimes, continuous waterlogging (CWL) and alternate wetting and drying (AWD), were investigated. With SM and WS total organic carbon and total nitrogen in the paddy soil were significantly higher (P < 0.05) than those with CF. A similar effect for organic amendments was observed in the soil light fraction organic C (LFOC), water-soluble carbohydrates (WSC), and water-soluble organic C (WSOC). CWL, in particular when swine manure was incorporated into the paddy soil, markedly decreased soil redox potential (Eh) and increased total active reducing substances (ARS). Meanwhile, as compared to CF, SM and WS significantly (P < 0.05) increased soil microbial biomass C (MBC) and mineralizable carbon, with differences in AWD being higher than CWL. In addition, SM and WS treatments significantly (P < 0.05) improved rice above-ground biomass and grain yield, with AWD being greater than CWL. Thus, for ecologically sustainable agricultural management of paddy soils, long-term waterlogging should be avoided when organic manure was incorporated into paddy soil. |
| Key Words: biological index of fertility, nutrient regimes, paddy soil quality, water regimes |
| Citation: Yang, C. M., Yang, L. Z. and Yan, T. M. 2005. Chemical and microbiological parameters of paddy soil quality as affected by different nutrient and water regimes. Pedosphere. 15(3): 369-378. |
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