Urease activity and urea hydrolysis in tropical flooded soil unplanted or planted to rice
✍ Scribed by Pattnaik, P; Mallick, K; Ramakrishnan, B; Adhya, T K; Sethunathan, N
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 98 KB
- Volume
- 79
- Category
- Article
- ISSN
- 0022-5142
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✦ Synopsis
Hydrolysis of urea associated with diþ erent component parts (surface and subsurface soil from unplanted and planted üelds and standing water) of tropical ýooded rice soil was investigated. Urea hydrolysis followed a ürst-order kinetics with surface soil having the highest urease activity followed by subsurface soil and ýood water. Urea hydrolysis varied with the crop growth stage and was more pronounced at tillering and panicle stages under greenhouse conditions and at maturity stage under üeld conditions. A certain degree of cultivar variation on urease activity at both surface and subsurface soil was also noticed. Urea hydrolysis was considerably higher in soils from green manure amended üeld plots than that of control and urea amended plots. Results indicate that addition of green manure to a ýooded soil, while increasing microbial activity, could also enhance urea hydrolysis.