Effect of Organic Materials on Growth and Nitrogen Use Efficiency of Rice in Paddy
2012
Cho, J.L., National Academy of Agricultural Science, RDA, Suwon, Republic of Korea | Choi, H.S., National Academy of Agricultural Science, RDA, Suwon, Republic of Korea | Lee, Y., National Academy of Agricultural Science, RDA, Suwon, Republic of Korea | Lee, S.M., National Academy of Agricultural Science, RDA, Suwon, Republic of Korea | Jung, S.K., Kyung Hee University, Yongin, Republic of Korea
This study was conducted to evaluate soil nutrient concentrations and N uptake efficiency of paddy rice as affected by nutrient sources from 2009 to 2011. The treatments included chemical fertilizer, compost, oilcake, oilcake 2X, hairy vetch, vetch+rye, and control. Nutrient applications were made at rates equivalent to approximately 90 kg of actual N per hectare. Oilcake had the lowest C:N ratio from the raw materials, but compost had the highest C:N ratio of 34:1. Soil pH and concentrations of C, N, Ca, and Mg were unaffected by nutrient source treatments. N uptake efficiency was the greatest for oilcake-treated rice compared to those treated by NPK, hairy vetch, and compost in 2009 and 2010. Compost-treated rice had the greatest N uptake efficiency in 2011 when the high amount of precipitation occurred.
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