| 저자(한글) |
Kim, Myung-Sook,Park, Seong-Jin,Lee, Chang-Hoon,Ko, Byong-Gu,Yun, Sun-Gang |
| 초록 |
In an experiment conducted at the research field of the National Institute of Agricultural Science, we investigated the effects of mineral fertilizer and rice straw compost on exchangeable potassium and K balances, and rice grain yield under a rice single system. The treatments were no fertilization (No fert.), inorganic fertilization (N), inorganic fertilizer (N, P, K) plus rice straw compost at rates of 7.5, 15.0, 22.5, and $30.0ton ;ha^{-1}$ (NPKC7.5, NPKC15.0, NPKC22.5, and NPKC30.0, respectively). The inorganic fertilizers(N, P, K) were added with standard fertilizer application rate in which nitrogen (N), phosphate ( $P_2O_5$ ), and potassium ( $K_2O$ ) were applied with $75{ sim}150kg ;ha^{-1}$ , $70{ sim}86kg ;ha^{-1}$ , $75{ sim}86kg ;ha^{-1}$ , respectively. Exchangeable potassium for NPKC15.0 NPKC22.5, and NPK30.0 treatments was higher by $0.05{ sim}0.19cmol_c ;kg^{-1}$ than that of NPKC7.5 treatment. Increasing levels of rice straw compost resulted in an increase in the K balance from - $19.9kg ;ha^{-1}yr^{-1}$ (No fert.) to $41.9kg ;ha^{-1}yr^{-1}$ at NPKC22.5 treatment and $62.9kg ;ha^{-1}$ at NPKC30.0 treatment. Continuous application of rice straw compost with NPK fertilizers affected significantly the rice grain yields. The result of the study imply that the application of more than $22.5ton ;ha^{-1}$ of rice straw compost with NPK fertilizers are recommended as the best fertilization practice for enhancement of crop production and K supplying power of soil in the continuous rice cropping system. |
