1960
DOI: 10.1017/s0021859600021596
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Nitrification of urea and its loss through volatilization of ammonia under different soil conditions

Abstract: Nitrification of urea and its loss through the volatilization of NH3 were studied under different soil conditions. Under all conditions less urea was nitrified and more time was needed for its nitrification in sandy than in sandy loam soil. Nitrification was favoured at lower concentration of urea, onethird moisture of the moisture-holding capacity and at neutrality or the alkaline pH.Loss of NH3 was found to be twice as much from the sandy loam as from the sandy soil. It was also found that half of the total … Show more

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Cited by 22 publications
(9 citation statements)
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“…The increase in the proportion ofurea-N lost with increasing application rate is consistent with other reports for acidic soils (Volk 1959;Overrein & Moe 1967;Lyster et al 1980). In studies where the natural soil pH was basic (Wahhab et al 1960;Hargrove & Kessel 1979;Stumpe et al 1983) the proportion of N lost was constant with increasing application rate. In our work and that of Overrein & Moe (1967), the higher the application rate, the more protracted was the period of high soil surface pH on the granule site.…”
Section: ----'mentioning
confidence: 99%
“…The increase in the proportion ofurea-N lost with increasing application rate is consistent with other reports for acidic soils (Volk 1959;Overrein & Moe 1967;Lyster et al 1980). In studies where the natural soil pH was basic (Wahhab et al 1960;Hargrove & Kessel 1979;Stumpe et al 1983) the proportion of N lost was constant with increasing application rate. In our work and that of Overrein & Moe (1967), the higher the application rate, the more protracted was the period of high soil surface pH on the granule site.…”
Section: ----'mentioning
confidence: 99%
“…3. Soil reaction; the optimum pH value for ammonification is around neutrality (Lee, et al, 1957); for nitrite formation is around 8.2 ( Hofman and Lees, 1953), and for nitrate formation is also about neutrality (Wahhab, et al, 1960).…”
Section: Introductionmentioning
confidence: 99%
“…-----AMMONIUM SULPHATE could be nitrified in 35 days and total-N found to be below the total-N added may be due to immobilization of added N or due to more volatilization losses in the form of NH 3, Wahhab et al 13 also found that nitrification was less and slow in sandy soil than in sandy loam soil. Although the overall transformation of N was faster in sandy loam than in sandy soil but still some NO2-N accumulated even in sandy loam which off course disappeared after about 30 days.…”
mentioning
confidence: 96%