COMPARISON OF REACTION RATE CONSTANTS FOR UREA IN UNSATURATED AND FLOODED SOIL CONDITIONS
Journal Title: International Journal of Agricultural Science and Research (IJASR) - Year 2018, Vol 8, Issue 6
Abstract
Urea is the main form of nitrogen fertilizer. An in-situ study was conducted to measure the movement and transformation of urea in unsaturated soils. An important step in analytical modeling is the determination of model parameters such as reaction rate constants. To estimate the reaction rate constants, Ammonia volatilized from soil spiked with urea is collected and analyzed periodically. Partial differential equations representing urea reactions were solved using risk solver platform in the MS-Excel environment. The estimated reaction rate constant for ammonia volatilization was found to give a good estimate of volatilized ammonia with that of the observed volatilized ammonia. The estimated reaction rate constants of urea hydrolysis, distribution coefficient, ammonia volatilization, and nitrification are 0.067h-1, 0.668 m3/g, 0.013h-1 and 0.0029h-1 respectively. The reaction rate constants estimated in unsaturated soil conditions are compared with flooded conditions. From the results, urea hydrolysis and Ammonia volatilization are higher in the unsaturated soil condition than the flooded soil condition. Distribution coefficient and nitrification coefficient are higher in flooded soil condition than unsaturated soil condition.
Authors and Affiliations
SHARMILADEVI R, RAVIKUMAR V
Keywords
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- EP ID EP438885
- DOI 10.24247/ijasrdec20181
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