Integrated nutrient management for environmental-friendly rice production in salt-affected rice paddy fields of Saemangeum reclaimed land of South Korea |
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Authors: | Jae Young Cho Jae Gwon Son Chang Hoon Song Seon Ah Hwang Young Min Lee Se Young Jeong Byung Yeoup Chung |
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Institution: | 1. Institute of Agricultural Science and Technology, Chonbuk National University, Jeonju, 561-756, South Korea 2. Department of Agricultural Engineering, Chonbuk National University, Jeonju, 561-756, South Korea 3. Department of Applied Life Sciences, Chonbuk National University, Jeonju, 561-756, South Korea 4. Crop Production and Technology Major, Chonbuk National University, Jeonju, 561-756, South Korea 5. Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute (KAERI), Jeongeup, 580-185, South Korea
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Abstract: | This study was conducted in an attempt to determine the proper nitrogen and phosphorus application levels, nitrogen split
application ratio, and application method for environmental-friendly rice production in a salt-affected rice paddy field,
which was located in the Saemangeum reclaimed tidal belt on the western coast of South Korea, between April 1, 2003 and October
10, 2004. All treatments were replicated three times in a randomized block design (5 m × 4 m plot) with 11 treatments (total
33 plots). We designed three treatments for the evaluation of reasonable application levels of nitrogen and phosphorus fertilizers
(A1–A3); five treatments to evaluate the nitrogen split application system (T1–T5); and three treatments to determine the
proper application for chemical fertilizer (M1–M3). There was no significant difference of amylose and protein content among
the application levels, application methods, and nitrogen split application ratios (P < 0.05). No significant differences in grain yield and yield components of rice were observed among the different application
levels, application methods, and nitrogen split application ratios (P < 0.05). In order to save labor in agricultural households, preserve or enhance the grain quality of rice, and reduce nutrient
losses, we determined that the optimum application level of nitrogen fertilizer was 140 kg ha−1; the application split ratio of nitrogen fertilizer at four different periods was 40% for basal fertilization, 20% for maximum
tilling stage, 30% for the panicle formation stage, and 10% for the booting stage; and the best application methods were deep
layer application and whole layer application. |
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Keywords: | Integrated nutrient management INM Environmental-friendly agriculture Reclaimed farmland Saemanguem |
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