Nitrogen-Decreasing and Yield-Increasing Effects of Combined Applications of Organic and Inorganic Fertilizers under Controlled Irrigation in a Paddy Field
Yuanyuan Li1,2, Xiaohou Shao1,2, Wenlu Guan1,2, Liang Ren3, Jie Liu3, Jinlan Wang4, Qijin Wu4
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1Key Laboratory of Effi cient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China,
Hohai University, Nanjing 210098, P.R. China
2College of Water Conservancy and Hydropower, Hohai University, Nanjing 210098, P.R. China
3Bureau of Comprehensive Development Ministry of Water Resources, Beijing 100053, P.R. China
4Water Affairs Bureau in Gaochun County, Nanjing 211300, P.R. China
Submission date: 2015-12-14
Final revision date: 2016-01-21
Acceptance date: 2016-01-22
Publication date: 2016-03-17
Pol. J. Environ. Stud. 2016;25(2):673-680
Inadequate fertilization may result in water pollution and nutrient leaching, especially in paddy fi elds. It is expected that the combination of organic and inorganic fertilizers reduces water pollution in addition to crop yield improvement. In this study, combined fertilization with organic and inorganic fertilizers was tested under controlled irrigation conditions. With the addition of organic fertilizer, the pH of paddy soil could be maintained in a rather neutral environment, and the soil organic matter concentration could increase – especially under a controlled irrigation regime. Hydrolyzed nitrogen was noticed in the fertilized plots with an increasing trend compared to unfertilized plots. However, available phosphorus concentration decreased in all treatments after rice harvest. During the drainage process, the ammonium nitrogen was the main form of nitrogen loss. Organic fertilizer application signifi cantly improved productive panicles and thus increased paddy yield. We concluded that with the combination of organic-inorganic fertilizer application and controlled irrigation, the pollutants can be removed to some extent and the rice yield can be increased signifi cantly, which is favorable for environmental protection and yield promotion.
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