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Impacts of Cover Crops on Early Growth, Nitrogen Uptake and Carbohydrate Composition of Pepper Plants  

Sung, Jwa-Kyung (Division of Organic Farming, NIAST, RDA)
Lee, Sang-Min (Division of Organic Farming, NIAST, RDA)
Lee, Yong-Hwan (Division of Organic Farming, NIAST, RDA)
Choi, Du-Hoi (Division of Organic Farming, NIAST, RDA)
Kim, Tae-Wan (Department of Plant Resources Science, Hankyong National University)
Song, Beom-Heon (Department of Plant Resources, Chungbuk National University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.41, no.1, 2008 , pp. 44-49 More about this Journal
Abstract
Sufficient inorganic nitrogen supply for crop growth is crucial for economically sustainable organic farming. The effects of an application of cover crop biomass on crop growth, nitrogen utilization and carbohydrate composition were investigated during early stage. Short-term changes in soil nitrogen after incorporating fresh hairy vetch and rye shoots were measured. The inorganic nitrogen from cover crops reached the peak at 15 ($NH_4-N$) and 24 ($NO_3-N$) days after incorporation, and then decreased rapidly. The highest concentration of soil nitrate showed at 27 days of incorporation in hairy vetch and at 18 days in rye, and three fold differences exhibited between two treatments. Crop growth under hairy vetch or rye incorporation significantly differed. At 20 DAT, dry matter production in NPK and hairy vetch was about two fold greater than that in rye. Difference in decomposing rates of hairy vetch and rye had also influence on nitrogen status in leaves and roots of pepper plants. Total nitrogen was greater in NPK and hairy vetch than in rye until 20 DAT, whereas inorganic nitrogen (nitrate and nitrite) concentration was higher in rye. Temporal changes in soluble sugars and starch in pepper plants among treatments were similar, although difference in the amount existed. It was suggested that hairy vetch as an alternative nitrogen source promoted crop growth and mineral utilization during early growth stage, whereas an obvious effect in rye was not found.
Keywords
Cover crop; Growth response; Nitrogen; Carbohydrate;
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