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| Pig Manure Maximum Loading Capacity of Red Clay Soil Under Peanut-Radish Rotation System in Southern China |
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| KeyWord:red clay soil; peanut; pig manure; maximum loading capacity |
| Author Name | Affiliation | | ZHANG Di | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences. Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | ZHOU Zhi-gao | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences. Nanjing 210008, China | | YANG Yi-ru | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences. Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | WANG Xing-xiang | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences. Nanjing 210008, China
Jiangxi Key Laboratory of Ecological Research of Red Soil, Experimental Station of Red Soil, Chinese Academy of Sciences, Yingtan 335211, Jiangxi, China |
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| Abstract: |
| Studying pig manure maximum loading capacity of soil would maximize manure utilization, reduce use of chemical fertilizer and prevent environmental pollution. In this study, maximum loading capacity of red clay soil for pig manure in peanut（Arachis hypogaea L.）-radish（Raphanus sativus L.） system was investigated in a pot experiment under natural rainfall in Ecological Experimental Station of Red Soil, Chinese Academy of Sciences. Three levels of chemical fertilizer treatments（zero, half and full level of chemical fertilizer） were set up in medium fertile red clay soil（soil organic carbon 5.16 g·kg-1，Olsen-P 28.34 mg·kg-1）. The full level of chemical fertilizer was 100 kg·hm-2 of nitrogen, 50 kg·hm-2 of phosphorus and 100 kg·hm-2 of potassium. The chemical fertilizer was treated every year. Seven pig manure rates（0, 25, 50, 100, 200, 400, 800 kg P·hm-2） were added to each chemical fertilizer treatment. Ammonium-N, nitrate-N and total phosphorus in leaching water, crop production and accumulation of nutrients in the soil were monitored. From the point of view of water and soil environment quality, the maximum safe application rate of pig manure should be less than 200 kg P·hm-2 for the treatment without chemical fertilizer, and 100 kg P·hm-2 for the treatment with half level of chemical fertilizer. However, there was risk of nitrate pollution in the treatment with full level of chemical fertilizer, even without pig manure added. Crop yields were not enhanced by applying pig manure at rates of more than 100 kg P·hm-2 together with chemical fertilizer. The present research indicates that under applying pig manure at 100 kg P·hm-2 or 24 000 kg·hm-2 manure would cut chemical fertilizers by half without reducing economic interests and environmental quality. |
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