Korkmaz Belliturk
Department of Soil Science, Faculty of Agriculture, Trakya University, 59030-Tekirdag, Turkey
M. Turgut Saglam
Department of Soil Science, Faculty of Agriculture, Trakya University, 59030-Tekirdag, Turkey
ABSTRACT
In this research, hydrolysis of urea added to soil having different chemical and physical characteristic and collected from Thrace Region were investigated in laboratory. For this purpose, urea-untreated and urea-treated soils were subjected to 14 day incubation and (NH4+ +NO3- +NO2-)-N were analysed daily. According to the results, 90% of soil samples were found to be insufficient in organic matter whereas; 45% of soil samples were rich in phosphorus. (NH4+ +NO3- +NO2-)-N of the soils increased during the experiment up to 7th day of the experiment and but decreased up to 14th days. When UHR considered, there was a negative relationships between the nitrogen {(NH4+ +NO3- +NO2-)-N, ppm} amount which was determined on the first day of incubation and sand amounts (%) (r=-0.629**). However, this relationship for clay (%), pH, lime (%) and CEC (meq/100 g) were positive (r=0.700**, r=0.464*. r=0.669** and r=0.655**, respectively). As for the 14th day of incubation, there was a positive relationships between nitrogen amount and lime content (%) (r=0.588**). No significant relationships were obtained on the 7th day of incubation. The rate of nitrogen hydrolysed from urea were found to be between 23.97 and 60.57% on the 1st day of incubation, 44.99 and 78.25% on the 7th day of incubation and 22.66 and 60.59% on the 14th day of incubation. After 7 days of incubation minimum 44.79% and maximum 78.25% of applied urea was hydrolysed.
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How to cite this article
Korkmaz Belliturk and M. Turgut Saglam, 2005. A Research on the Urea Hydrolysis Rate in the Soils of Turkey. Pakistan Journal of Biological Sciences, 8: 446-449.
DOI: 10.3923/pjbs.2005.446.449
URL: https://scialert.net/abstract/?doi=pjbs.2005.446.449
DOI: 10.3923/pjbs.2005.446.449
URL: https://scialert.net/abstract/?doi=pjbs.2005.446.449
REFERENCES
- Bremner, J.M. and L.A. Douglas, 1971. Decomposition of urea phosphate in soils. Soil Sci. Soc. Am. Proc., 35: 575-578.
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