Abstract
Two incubation experiments were conducted to investigate the effect of pellet size and rate of application on NH3 volatilization from surface-applied urea and on subsequent soil N transformations. In the first experiment fertilizer grade urea was applied as prills (1–2 mm diameter) or in four commercially available granule sizes with diameters of 2–3 mm, 3–4 mm, 5–6.3 mm and 6.3–8 mm. The five urea pellet sizes were applied to the soil surface of one soil at various N rates. In the second experiment four soils were used where the different pellet sizes were applied at a single application rate. The daily rates of NH3 loss were measured over 14 days in the laboratory under simulated spring conditions using ventilated enclosures.
In the first experiment the highest total NH3 loss (Amax) was 17.4% of the urea N applied. Amax increased curvilinearly with rate of N applied up to the equivalent of 200 kg N ha−1. Higher rates of application did not lead to any further increase. Increasing the rate of N applied delayed the time to maximum rate of loss (Tmax), lowered soil NO -3 —N levels and decreased total mineral N that could be recovered at the end of the incubation.
The effect of pellet size on NH3 volatilization was dependent on soil type. On 2 soils studied pellet size had no significant effect whereas on other soils large granules could decrease or increase NH3 loss. However the effects were small. There was little difference on any of the soils between prills and the three smallest granule sizes on Amax or Tmax. The greatest effect was with the largest granules on soil 2. There was little difference between granule sizes on soil N transformations. However, N transformations from prills appeared to be different to the other pellet sizes.
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References
Black AS, Sherlock RR and Smith NP (1987) Effect of urea granule size on ammonia volatilization from surface-applied urea. Fert Res 11: 87–96
Black AS, Sherlock RR, Smith NP, Cameron KC and Goh KM (1985) Effects of form of nitrogen, season, and urea application rate on ammonia volatilisation from pastures. New Zealand J Agric Res 28: 469–474
Bristow AW, Ryden JC and Whitehead DC (1987) The fate at several time intervals of15N-labelled ammonium nitrate applied to an established grass sward. J Soil Sci 38: 245–254
Buresh RJ, Vlek PLG and Stumpe JM (1984) Labeled nitrogen fertilizer research with urea in the semi-arid tropics. I. Greenhouse studies. Plant and Soil 80: 3–19
Chalk PM and Smith CJ (1983) Chemodenitrification. In Freney JR and Simpson JR (eds). Gaseous Loss of Nitrogen from Plant-Soil Systems, pp 65–89. The Hague: Martinus Nijhoff/Dr W Junk
Chaney K and Paulson GA (1988) Field experiments comparing ammonium nitrate and urea top-dressing for winter cereals and grassland in the UK. J Agric Sci 110: 285–299
Creamer FL and Fox RH (1980) The toxicity of banded urea or diammonium phosphate to corn as influenced by soil temperature, moisture and pH. Soil Sci Soc Am J 44: 296–300
Eriksen AB, Kjeldby M and Nilsen S (1985) The effect of intermittent flooding on the growth and yield of wetland rice and nitrogen-loss mechanism with surface applied and deep placed urea. Plant and Soil 84: 387–401
Fenn LB and Hossner LR (1985) Ammonia volatilization from ammonium or ammonium-forming nitrogen fertilizers. Adv Soil Sci 1: 123–169
Fenn LB, Matocha JE and Wu E (1980) A comparison of calcium carbonate precipitation and pH depression on calcium-reduced ammonia loss from surface-applied urea. Soil Sci Soc Am J 44: 1128–1131
Freney JR, Simpson JR and Denmead OT (1983) Volatilization of ammonia. In Freney JR and Simpson JR (eds). Gaseous Loss of Nitrogen from Plant-Soil systems, pp 1–32. The Hague: Martinus Nijhoff/Dr W Junk
Kissel DE, Brewer HL and Arkin GF (1977) Design and test of a field sampler for ammonia volatilization. Soil Sci Soc Am J 41: 1133–1138
Lloyd D, Boddy L and Davies KJP (1987) Persistence of bacterial denitrification capacity under aerobic conditions: the rule rather than the exception. FEMS Microbiol Ecol 45: 185–190
Lyster S, Morgan MA and O'Toole P (1980) Ammonia volatilization from soils fertilized with urea and ammonium nitrate. J Life Sci R Dubl Soc 1: 167–176
Malhi SS and McGill WB (1982) Nitrification in three Alberta soils. Effect of temperature, moisture and substrate concentration. Soil Biol Biochem 14: 393–399
Malhi SS and Nyborg M (1979) Rate of hydrolysis of urea as influenced by thiourea and pellet size. Plant and Soil 51: 177–186
Ministry of Agriculture, Fisheries and Food (1986) The Analysis of Agricultural Materials, London: HMSO
Morrill LG and Dawson JE (1967) Patterns observed for the oxidation of ammonium to nitrate by soil organisms. Soil Sci Soc Am Proc 31: 757–760
Mulvaney RL and Bremner JM (1979) A modified diacetyl monoxime method for colorimetric determination of urea in soil extracts. Commun in Soil Sci Plant Anal 10: 1163–1170
Murphy WE (1983) Comparing urea and CAN at different locations. Farm and Food Res 14: 41–43
Nommik H (1973) The effect of pellet size on the ammonia loss from urea applied to forest soil. Plant and Soil 39: 309–318
O'Connor MJ and Hendrickson LL (1987) Effect of phenylphosphorodiamidate on ammonia volatilization as affected by soil temperature and rates and distribution of urea. Soil Sci Soc Am J 51: 1062–1066
Overrein LN and Moe PG (1967) Factors affecting urea hydrolysis and ammonia volatilization in soil. Soil Sci Soc Am Proc 31: 57–61
Prins WH and Rauw GJG (1989) Use of large granular urea (LGU) to improve efficiency of broadcast urea in wetland rice cultivation. Fert Res 19: 21–27
Singh Y and Beauchamp EG (1987) Nitrification inhibition with large urea granules, dicyandiamide and low soil temperature. Soil Sci 144: 412–419
Stevens RJ, Laughlin RJ and Kilpatrick DJ (1989) Soil properties related to the dynamics of ammonia volatilization from urea applied to the surface of acidic soils. Fert Res 20: 1–9
Stumpe JM, Vlek PLG and Lindsay WL (1984) Ammonia volatilization from urea and urea phosphates in calcareous soils. Soil Sci Soc Am J 48: 921–927
Sudhakara K and Prasad R (1986) Ammonia volatilization losses from prilled urea, urea supergranules (USG) and coated USG in rice fields. Plant and Soil 94: 293–295
Van Burg PFJ, Dilz K and Prins WH (1982) Agricultural value of various nitrogen fertilizers. Netherlands Nitrogen Technical Bulletin No 13: 51 pp
Vlek PLG and Carter MF (1983) The effect of soil environment and fertilizer modifications on the rate of urea hydrolysis. Soil Sci 136: 56–63
Volk GM (1961) Gaseous loss of ammonia from surface-applied nitrogenous fertilizers. J Agric Fd Chem 9: 280–283
Wahhab A, Khan M and Ishaq M (1960) Nitrification of urea and its loss through volatilization of ammonia under different soil conditions. J Agric Sci 55: 47–51
Watkins SH, Stand RF, DeBell DS and Esch J (1972) Factors influencing ammonia losses from urea applied to North-western forest soils. Soil Sci Soc Am Proc 36: 354–357
Watson CJ (1990) The influence of soil properties on the effectiveness of phenylphosphorodiamidate (PPD) in reducing ammonia volatilization from surface applied urea. Fert Res 24: 1–10
Zantua MI and Bremner JM (1975) Comparison of methods of assaying urease activity in soils. Soil Biol Biochem 7: 291–295
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Watson, C.J., Kilpatrick, D.J. The effect of urea pellet size and rate of application on ammonia volatilization and soil nitrogen dynamics. Fertilizer Research 28, 163–172 (1991). https://doi.org/10.1007/BF01049746
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DOI: https://doi.org/10.1007/BF01049746