Effect of timing of simulated rainfall on ammonia volatilization from urea, applied to soil of varyingmoisture content
作者:
A. S. BLACK,
R. R. SHERLOCK,
N. P. SMITH,
期刊:
Journal of Soil Science
(WILEY Available online 1987)
卷期:
Volume 38,
issue 4
页码: 679-687
ISSN:0022-4588
年代: 1987
DOI:10.1111/j.1365-2389.1987.tb02165.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
SUMMARYAmmonia volatilization from granular urea applied at 10gNm−2to pasture was investigated using an enclosure method. Misting 0, 4 or 16 mm of water on to the soil at field capacity within 3 h of urea application resulted in total NH3losses of 2.81, 0.92 and 0.18 g N m−2respectively. Further delaying the watering reduced this effect until at 48 h, volatilization was lowered from 3.33 to only 3.09gNm−2with 16mm of water. Hydrolysis and NH3loss were rapid. Similar trends occurred at a lower initial soil moisture content.On air‐dry soil (0.06 g H2O/g soil), hydrolysis was slow (73 ± 14% of the urea remained after 30 days) and volatilization, while gradual, accounted for 33% of applied urea‐N after 30 days. Addition of 16 mm of water 48 and 96 h after urea application was followed by a period of rapid hydrolysis and volatilization, resulting in a total loss of 2.59 and 2.40gNm−2respectively. Repeated addition of 2mm of water produced bursts of hydrolysis and NH3loss until completion of hydrolysis when additional water had no effect. A total loss after 30 days of 3.94 g N m−2occurred in this
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