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The Effects of Organic Materials on Yield and N Use Efficiency of Organic Rice Grown under Frequent Heavy Rains
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 Title & Authors
The Effects of Organic Materials on Yield and N Use Efficiency of Organic Rice Grown under Frequent Heavy Rains
Cho, Jung-Lai; Lee, Youn; Choi, Hyun-Sug; Kim, Wol-Soo;
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 Abstract
BACKGROUND: This study was conducted to investigate growth and yield of organically grown rice under a typhoon during a fall. The treatments included NPK chemical fertilizer, compost, oilcake, oilcake 2X, hairyvetch, and vetch+rye. METHODS AND RESULTS: Nutrient applications were made at rates equivalent to approximately 0.9 kg of actual N per acre. Oilcake and hairyvetch treatments had the lowest C:N ratio, but compost had the highest C:N ratio of 34:1. Rice treated by organic nutrient sources had great growth and development at the beginning of the growing season but had depressed growth and yield at the harvest. Oilcake 2X-treated rice in early growing season, especially, showed better growth and development than rice treated by other nutrient sources but was severely lodged at the harvest season due to the typhoon. Compost treatment with high C:N ratio slowly released inorganic N and produced poor rice growth and yield; however, it recued rice lodging. N uptake was the greatest for the oilcake 2X and vetch+rye treatments but the lowest for the compost, which was the similar pattern to the N use efficiency; the greatest and lowest N use efficiency was observed for the oilcake 2X (55%) and compost (5%), respectively. CONCLUSION(s): Rice lodging should be prevented by reducing the excessive nitrogen supplement, resulting from the lower C:N ratio of the organic materials as well as prevented by the radical midsummer drainage. Vetch+rye treatment with 25:1 of C:N had optimum vegetative growth and reduced rice lodging, which increased N use efficiency and yield.
 Keywords
Compost;Hairyvetch;Nitrogen;Oilcake;Rye;
 Language
Korean
 Cited by
1.
유기자재와 강수량이 수수${\times}$수단그라스 교잡종의 질소이용효율에 미치는 영향,최현석;이연;정정아;지형진;이상민;국용인;정석규;

한국유기농업학회지, 2012. vol.20. 3, pp.357-368
2.
유기자재 시용이 벼의 생육과 질소이용효율에 미치는 영향,조정래;최현석;이연;이상민;정석규;

한국유기농업학회지, 2012. vol.20. 2, pp.211-220
3.
신규 개간 유기농경지에서 가축분 퇴비와 녹비작물 연용에 따른 밭 토양의 이화학적 특성 변화 모니터링,옥정훈;조정래;이병모;안난희;신재훈;

한국유기농업학회지, 2015. vol.23. 4, pp.813-827 crossref(new window)
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