Growth and Yield Response of Chinese Cabbage and Radish on Application of Potassium Chloride Fertilizer
2003
Song, Y.S. | Kwak, H.K. | Yeon, B.Y. | Yoon, J.H. | Jun, H.J. (National Institute of Agricultural Science and Technology, Suwon, Republic of Korea)
The application of potassium above the optimum level may cause the inhibition of plant growth, fertilizer loss, and environmental pollution. Therefore, application rate of K fertilizer should be recommended on the basis of soil test. In order to determine critical K content in soils causing growth inhibition of vegetables, 1 m2-pot experiment with Chinese cabbage and radish were accomplished with various K-application rates. The threshold concentrations of exchangeable potassium causing the inhibition of plant growth were 0.96 cmolc kg-1 for Chinese cabbage in spring, and 1.28 cmolc kg-1 for radish in autumn. Above those concentration levels, the yields of them were decreased with the increase of the electrical conductivity (EC) of soils due to application of potassium fertilizer. In the harvesting stage, the potassium contents of plant were increased with the increase of K application rate while plant uptake of nutrients was decreased at the K adjustment level of over 2.0 cmolc kg-1.
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