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http://dx.doi.org/10.5338/KJEA.2006.25.1.071

Optimum Nitrogen Fertilization Based on Soil Testing for Rice Cultivation in Different Paddy Soils  

Choi, Yong-Jo (Gyeongsangnam-do Agricultural Research and Extension Services)
Lee, Seong-Tae (Gyeongsangnam-do Agricultural Research and Extension Services)
Kang, Jin-Ho (Division of Applied Life Science, Gyeongsang National Univ.)
Lee, Young-Han (Gyeongsangnam-do Agricultural Research and Extension Services)
Publication Information
Korean Journal of Environmental Agriculture / v.25, no.1, 2006 , pp. 71-76 More about this Journal
Abstract
Environment friendly agriculture is nowadays a major fiend to sustain balanced agricultural ecosystem, keeping its productivity. This study was conducted to determine the optimum levels of nitrogen (N) application for improving rice productivity and reducing N loss through N application based on soil diagnosis. four levels of N were applied with 0, 50, 100 and 150% of recommended levels by soil testing in 4 different paddy soils (i.e. normal, sandy, ill-drained and immature soils). Across N treatments, the greatest grain yield was observed in sandy soil and the lowest in ill-drained soil. The grain yield tended to decrease with increasing N application from 50% to 150% of recommended levels, except ill-drained soil. To ensure maximum yield the optimum levels of N application were estimated at 120 kg, 153 kg and 173 kg $ha^{-1}$ in normal, immature and sandy soil, respectively.
Keywords
Rice; Nitrogen; Soil testing; Soil type;
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