Recovery of Fertilizer-Nitrogen by Rice Grown in a Greenhouse Under Varying Soil- and Climatic Conditions
Under field conditions, the efficiency with which urea is utilized by paddy rice is commonly low. Recovery values below 50% are often reported1. Volatilization of NH3 formed in alkaline media, after hydrolysis of the urea to (NH4)2 CO3, and denitrification of NO3, after formation from NH4, are usually looked upon as the main causes of low efficiency of urea-N.
KeywordsClay Hydrolysis Urea Immobilization Photosynthesis
Unable to display preview. Download preview PDF.
- (1).De Datta, S.K., Stangel, P.J. and Craswell, E.T. Evaluation of nitrogen fertility and increasing fertilizer efficiency in wetland rice soils. Proc. Symp. Rice Soils, Nanjing, People’s Republic of China, - (1981).Google Scholar
- (2).Broadbent, F.E. Nitrogen transformation in flooded rice. Soil and Rice, Int. Rice Research Inst., Los Banjos, Philippines, 543–559 (1978).Google Scholar
- (3).Ishizuka, Y. The rice yield competition in Japan, Potash Review, subject 9, no. 6, Int. Potash Inst., Berne, Switzerland (1979)Google Scholar