Effect of blending urea with pyrite or coating urea with polymer on ammonia volatilization loss from surface-applied prilled urea
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Abstract
Laboratory studies on a sandy clay loam (Typic Ustochrept) alkaline soil showed that NH3 volatilization loss from surface-applied prilled urea during an 8-dya incubation under aerobic conditions was 27.5% of applied N (400 kg N ha-1) and was reduced to 8.9% when the urea was blended physically with pyrite in a 1:2 ratio; under anaerobic conditions the values for urea and pyrite-urea were 19.3 and 16.9%, respectively. Other treatments tested were urea-gypsum, neemcake-coated urea and polymer-coated urea. A 6% polymer coating showed the least NH3 volatilization under anaerobic conditions and was next best to pyrite-urea under aerobic conditions. A 3% polymer coating was slightly inferior to the 6% coating. Urea-gypsum and neemcake-coated urea did not differ very much from urea alone under anaerobic conditions, but under aerobic conditions neemcake-urea showed a significantly lower total NH3 loss compared to prilled urea alone and urea-gypsum.
Key words
Ammonia volatilization Neemcake-coated urea Polymer-coated urea Pyrite-blended urea UreaPreview
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References
- Bangar KC, Kapoor KK, Mishra MM (1988) Effects of pyrite on conservation of nitrogen during composting. Biol Wastes 25:227–231Google Scholar
- Blaise D, Prasad R (1993) Evaluating pyrites as a nitrification inhibitor. Fert News 38:43–45Google Scholar
- Buresh RJ (1987) Relative susceptibility of conventional and experimental nitrogen sources to ammonia loss from flooded rice fields. Fert Res 13:139–153Google Scholar
- Chauhan HS, Mishra B (1989) Ammonia volatilization from a flooded rice field fertilized with amended urea materials. Fert Res 19:57–63Google Scholar
- Fenn LB, Richards J (1986) Ammonia loss from surface applied urea-acid products. Fert Res 9:265–275Google Scholar
- Fillery IRP, Vlek PLG (1986) Reappraisal of the significance of ammonia volatilization as an N loss mechanism in flooded rice fields. Fert Res 9:89–98Google Scholar
- Gomez KA, Gomez AA (1984) Statistical procedures for agricultural research, 2nd edn. Wiley and sons, SingaporeGoogle Scholar
- Keeney DR, Nelson DW (1982) Nitrogen-inorganic forms. In: Page AL, Miller RH, Keeney DR (eds) Methods of soil analysis. Part 2. Chemical and microbiological properties, 2nd edn. Am Soc Agron, Madison, Wis, pp 643–698Google Scholar
- Pichtel JR, Dick WA (1991) Sulfur, iron and solid phase transformations during the biological oxidation of pyritic mine spoil. Soil Biol Biochem 23:101–107Google Scholar
- Rao DLN (1987) Slow-release urea fertilizers — effect on floodwater chemistry, ammonia volatilization and rice growth in an alkali soil. Fert Res 3:209–221Google Scholar
- Reddy RVM, Mishra B, Sharma D (1986) Ammonia volatilization from three Mollisols following surface application of urea under laboratory conditions. J Indian Soil Sci 34:43–46Google Scholar
- Simpson JR, Muirhead WA, Bowmer KH, Cai GX, Freeney JR (1988) Control of gaseous nitrogen losses from urea applied to flooded rice soils. Fert Res 16:31–47Google Scholar
- Sudhakara K, Prasad R (1986) Ammonia volatilization from prilled urea, urea supergranules (USG) and coated USG in rice fields Plant and Soil 94:293–295Google Scholar
- Vlek PLG, Stumpe JM; Byrnes BH (1980) Urease activity and inhibition in flooded soil systems. Fert Res 1:191–202Google Scholar