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Growth and Yield Response of Chinese Cabbage and Radish on Application of Potassium Chloride Fertilizer  

Song, Yo-Sung (National Institute of Agricultural Science and Technology)
Kwak, Han-Kang (National Institute of Agricultural Science and Technology)
Yeon, Byeong-Yeol (National Institute of Agricultural Science and Technology)
Yoon, Jung-Hui (National Institute of Agricultural Science and Technology)
Jun, Hee-Joong (National Institute of Agricultural Science and Technology)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.36, no.6, 2003 , pp. 399-406 More about this Journal
Abstract
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, $1m^2-pot$ experiments 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 $0.96cmol_c\;kg^{-1}$ for Chinese cabbage in spring, and $1.28cmol_c\;kg^{-1}$ for radish in autumn. Above those concentration levels, the yields of them were decreased with the increase of potassium levels in soils. Germination rate of Chinese cabbage in spring decreased with 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 $2.0cmol_c\;kg^{-1}$.
Keywords
Chinese cabbage; Exchangeable potassium; Potassium chloride; Radish;
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