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| Effects of long-term and short-term organic fertilizer application on mineralized nitrogen loss in vegetable planting system |
| Received:August 31, 2024 |
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| KeyWord:nitrogen mineralization;vegetable system;organic fertilizer;nitrogen leaching loss |
| Author Name | Affiliation | E-mail | | ZHANG Yafei | College of Environment and Ecology, Jiangnan University, Wuxi 214122, China | | | LI Xiufen | College of Environment and Ecology, Jiangnan University, Wuxi 214122, China | | | YU Yingliang | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Key Research Laboratory of Agricultural Environment in the Lower Reaches of the Yangtze River Plain, Ministry of Agriculture, Nanjing 210014, China | colleen_yu@163.com | | YANG Linzhang | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Key Research Laboratory of Agricultural Environment in the Lower Reaches of the Yangtze River Plain, Ministry of Agriculture, Nanjing 210014, China | | | XUE Lihong | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Key Research Laboratory of Agricultural Environment in the Lower Reaches of the Yangtze River Plain, Ministry of Agriculture, Nanjing 210014, China | | | XU Fei | Wuzhong District Agricultural and Rural Bureau, Suzhou City, Suzhou 215104, China | | | HAN Xuemei | Wuzhong District Agricultural and Rural Bureau, Suzhou City, Suzhou 215104, China | | | WANG Jiaxi | Hai'an Agricultural and Rural Bureau, Hai'an 226699, China | |
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| Abstract: |
| Active nitrogen from chemical fertilizer and mineralization of nitrogen in soil and organic fertilizers, is the main substance supporting crop growth and loss in planting system. Studies on nitrogen efficiency improvement and emission reduction of active nitrogen mostly focus on chemical fertilizers; however, mineralized nitrogen is rarely isolated for study. Especially in vegetable systems where organic fertilizer is widely applied, the effect of organic fertilizer on mineralized nitrogen loss is still not clear. Therefore, 2 vegetable soils were selected for this study with one applied only chemical fertilizer over 10 years and the other applied organic and chemical fertilizers in last 4 years. The incubation test and planting experiment were carried out simultaneously to explore the effects of long-term and short-term application of organic fertilizer on nitrogen mineralization process and crop utilization and loss of mineralized nitrogen in planting system. The results showed that long-term combined application of organic fertilizer could improve soil nitrogen mineralization rate due to the more neutral pH and lower bulk density of vegetable soil. More than 70% of nitrogen uptake by crops was from mineralized nitrogen rather than seasonal fertilizer nitrogen. Fertilizer nitrogen is the main source for nitrogen leaching in vegetable systems, accounting for 41%-75%. It was indicated that long-term application of organic fertilizer could reduce the dependence of crop yield on fertilizer nitrogen and improve yield stability. Although long-term application of organic fertilizer increased the risk of mineralized nitrogen loss, it effectively reduced the amount of total nitrogen loss from leaching route, and also controlled the loss risk of retained active nitrogen in soil in the later period. It is concluded that long-term application of organic fertilizer could achieve the balance between agricultural production and environmental protection. |
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