Effect of organic matter and silica on N-fertilizer response in paddy soils
1987
Lee, C.S. | Hwang, K.S. | Kwak, H.K. | park, J.K. | Han, K.H. (Rural Development Administration, Suwon (Korea R.). Agricultural Sciences Inst.) | Kim, Y.S. (Rural Development Administration, Suwon (Korea R.). Research Bureau)
Field experiments were conducted to evaluate yield response of applied and absorbed nitrogen for Nagdongbyeo grown in different content of organic matter and available silica in soil. The optimum levels of N-fertilizer for maximum yield were 16.5 kg/10a for improved plot and 15.9kg/10a for controlled plot. The uptakes of SiO2 and K2O, and the uptake ratios of SiO2/N and K2O/N by rice plant at improved plot were considerably higher than those at controlled plot. The critical uptakes by rice plant which showe1443d maximum yield were 13.5kg for N and 112kg for SiO2, respectively. And the critical contents of organic matter and available silica of soil for maximum using efficiency were 3.0 % and 200 ppm, respectively. The multiple regression equation for yield prediction based on the content of organic matter and available silica in soil was sugge
显示更多 [+] 显示较少 [-]