Recommendations of NPK Fertilizers based on Soil Testing and Yied Response for Carrot in Highland
2009
Lee, G.J., Highland Agriculture Research Center, NICS, RDA, Pyeongchang, Republic of Korea | Lee, J.T., Highland Agriculture Research Center, NICS, RDA, Pyeongchang, Republic of Korea | Zhang, Y.S., National Academy of Agricultural Science, RDA, Suwon, Republic of Korea | Hwang, S.W., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Park, C.S., KTnG Central Research Institute, Daejeon, Republic of Korea | Joo, J.H., Kangwon National University, Chuncheon, Republic of Korea
An attempt was made to provide the most resonable fertilizer recommendation for carrot crop based on soil analytical data and yield response to the NPK fertilizers, which was obtained from field experiments on 2003 in highland, 850 meters above the sea level. Optimum times of N, P, K application to current application methods based on soil test were 0.75-0.50-0.50 for carrot. The adjusted N, P, K recommendation models of highland soil were made by adding the application times to past application methods which were based on chemical properties of soil. The revised models for fertilizer application were recommended to decrease the amount of N-P-K by 25-50-50% for carrot in highland. In application to total cultivation area, 135ha for carrot, saving amounts of NPK fertilizers with these adjusted recommendation in comparison with past application levels will be 23.0 tons for carrot. Using the optimal application amounts for carrot, we will can reduce agricultural pollution without affecting crop yields.
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