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Post Harvest Cropping Impacts on Soil Properties in Continuous Watermelon (Citrullus lanatus Thunb.) Cultivation Plots  

Ahn, Byung-Koo (Research Center for Biotic Environment, Jeonbuk Agricultural Research and Extension Services)
Kim, Dae-Hyang (Research Center for Biotic Environment, Jeonbuk Agricultural Research and Extension Services)
Lee, Jin-Ho (Research Center of Bioactive Materials, Chonbuk National University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.40, no.1, 2007 , pp. 98-107 More about this Journal
Abstract
Most of plastic film house plots in Korea have salinity problems caused by salt accumulations associated with continuous cropping including the heavy applications of chemical fertilizers, and high evapotranspiration. The objective of this study was to investigate soil properties and watermelon (Citrullus lanatus Thunb.) productivity in plastic film houses as influenced by the short-term crop rotation in the continuous watermelon-cultivated soils. The short-term rotational crops selected were corn, Chinese cabbage, radish, young radish, lettuce, spinach, and onion. Soil pH increased in most plots where a short-term crop was added to the crop rotation, except where radish was added. The content of soil organic matter significantly decreased in the lettuce-cultivated plot. The available phosphorus content in the soils increased with the cultivations of spinach and onion. Exchangeable Ca and Mg tended to increase in most of plots where a short-term rotational crop was grown, whereas the exchangeable K was clearly reduced by more than 50% in the same plots. Cultivation of rotational crops during the post-harvest season significantly decreased the electrical conductivity (EC) and the concentrations of soluble anions, such as chloride ($Cl^-$), nitrate ($NO_3{^-}$), and sulfate ($SO{_4}^{2-}$) in the soils. In particular, the EC decrease was related with the decrease in soil $K^+$ to $Ca^{2+}$ and $Mg^{2+}$ ratio. In all plots cultivated with the shot-term rotational crops, the ratios of bacteria to fungi (B/F) increased. However, the improvement in soil properties after adding a rotational crop did not result in a clear improvement in watermelon quantity or quality as measured by fruit weight and sugar content. Therefore, the addition of short-term rotational crops to a continuous watermelon cropping system would be beneficial to improve target soil properties in plastic film house plots studied.
Keywords
Crop rotation; Short-term rotational crop; Salt accumulation; Soil properties;
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Times Cited By KSCI : 2  (Citation Analysis)
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