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Ammonia volatilization from rice fields in alkaline soil as influenced by soil moisture and nitrogen

Published online by Cambridge University Press:  27 March 2009

R. B. Singandhupe
Affiliation:
Central Soil Salinity Research Institute, Karnal 132001, Haryana, India
R. K. Rajput
Affiliation:
Central Soil Salinity Research Institute, Karnal 132001, Haryana, India

Summary

Volatilization of ammonia from urea applied to rice on a soil of pH 9·3 was measured during 1982 and 1983 at Karnal. For three moisture regimes (continuous submergence, and irrigation 1 day and 4 days following subsidence of ponded water) mean ammonia losses varied from 28·2 to 31·8 kg N/ha. For urea applications between 40 and 120 kg N/ha, mean ammonia losses varied from 26.1 to 33.7 kg N/ha. Ammonia losses were highest on the second day following urea application and dropped to near zero 7–8 days after application.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1989

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