Estimation for application amount of N fertilizer in mid mountainous paddy soils with special reference to content of organic matter and available silica in soils
1988
Lee, C.S. | Kwak, H.K. | Hwang, K.S. | Park, J.K. (Rural Development Administration, Suwon (Korea R.). Agricultural Sciences Institute)
Field experiments were carried out to evaluate the optimum application of N-fertilizer with different content of soil organic matter and available silica for early maturing japonica rice cultivar in mid-mountain area. The optimum rates of N-fertilizer under controlled and improved soil plots were 12.7 and 14.8 kg/10a respectively. The estimation for optimal application amount of N-fertilizer in mid-mountainous paddy soils was calculated from the multiple regression equation of plain area with correction factor of F value, the ratio of N application rates obtained from the field experiment and soil test. The F value was 0.87 in controlled soil and 1.01, improved one
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