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Influence of Gravel Content and Nitrogen Application on Nitrogen Leaching by the Leachate and Chinese Cabbage Growth in Highland
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 Title & Authors
Influence of Gravel Content and Nitrogen Application on Nitrogen Leaching by the Leachate and Chinese Cabbage Growth in Highland
Park, Chol-Soo; Lee, Gye-Jun; Jung, Yeong-Sang; Joo, Jin-Ho; Hwang, Seon-Woong;
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Continuous monocropping of Chinese cabbage in Gangwon highland increased gravel and sand contents due to surface soil erosion. Nutrient leaching and Chinese cabbage growth were investigated with different treatments of gravel contents and nitrogen application levels by using Wagner pots. Gravel contents were 0, 10, 30, 50, 70, and 90%(w/w), nitrogen application levels were 60, 120, and 240 kg/ha, and manure compost application rate was 15 ton per hectare, respectively. Wagner pots were filled with loamy sand soil mixed with 5 cm-sized gravels. Fresh weight of Chinese cabbage was decreased as gravel contents in soil increased, and particularly severely decreased at 240 kg-N/ha. Yields of Chinese cabbage were remarkably decreased at the rate of 60 kg-N/ha with 30% gravel content and 120 kg-N/ha with 50% gravel content. Most of Chinese cabbages were severely wilted by heavy N application at the rate of 240 kg-N/ha in the middle of growth stages regardless of gravel contents, while about 50% of Chinese cabbage showed wilting symptom in the treatment of more than 50% of gravel contents and 120 kg-N/ha. N content in leachate increased as gravel content and N application increased. The relationship between gravel content and N contents showed linear regression: N in leachate = 0.014(gravel content) -0.039 (r = 0.961). Particularly, contents in leachates with more than 30% gravel content and 240 kg-N/ha ranged from . Chinese cabbage growth in loamy sand soil containing 30%, and 50% gravel contents could be adversely affected by N application at the rate of 240, and 120 kg-N/ha, respectively.
gravel content;nitrogen application;nitrogen leaching;Chinese cabbage growth;highland;
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