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| Nutrient Inputs and Soil Fertility Status in Orchards of Zhushan Bay in Taihu Lake Watershed |
| Received:March 10, 2014 |
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| KeyWord:Taihu Lake Watershed;orchard;N,P and K application;organic fertilizer;nutrient surplus |
| Author Name | Affiliation | E-mail | | CHENG Yi | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | JIA Yun-sheng | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | WANG Yu | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | ZHAO Xu | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | YANG Lin-zhang | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | WANG Shen-qiang | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | sqwang@issas.ac.cn |
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| Abstract: |
| Planting around the Taihu Lake contributes greatly to its water pollution. In this research, both literature and questionnaire surveys(farmer interview) were used to analyze nutrient inputs to orchards, and typical soil samples were collected to evaluate soil fertility status in the surrounding five towns in Zhushan Bay in Taihu Lake Watershed. Results showed that average rates of total N, P and K inputs were N 522, P2O5 674 and K2O 462 kg· hm-2, respectively, in orchards in Taihu Lake Watershed. Of which, organic fertilizer inputs accounted for 51.3%、58.3% and 44.0% of total N, P and K application, respectively. Chemical fertilizer was mainly NPK compound fertilizer, while organic fertilizer was chicken and cattle manure. Soil organic matter, total N, P and K content ranged from appropriate to very rich. Available P and K contents were generally at a rich level. The average surplus of N, P and K were as high as N 320、P2O5 42 and K2O 108 kg·hm-2, respectively. High inputs of N and P to soils inevitably increased the risk of N and P migration into water. It is necessary to develop effective techniques to control N and P inputs while maintaining fruit production in orchard in Taihu Lake Watershed. |
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