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Mineralization and field effectiveness of ordinary and coated urea, urea-aldehyde condensation product and urea treated with nitrification inhibitor

Published online by Cambridge University Press:  27 March 2009

K. P. P. Nair  and
P. B. Sharma
K. P. P. Nair
Affiliation:
Department of Agronomy, College of Agriculture, G.B. Pant University of Agriculture and Technology, Pantnagar, India
P. B. Sharma
Affiliation:
Department of Agronomy, College of Agriculture, G.B. Pant University of Agriculture and Technology, Pantnagar, India
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Summary

A laboratory incubation study followed by a field experiment was made in a silty clay loam soil (pH 6·9) at Pantnagar, India, on the effectiveness of ordinary urea, coated urea (sulphur and shellac-coated), urea-isobutyraldehyde condensation product (isobutylidenediurea, IBDU) and urea blended with nitrification inhibitor AM (2- amino-4 chloro-6-methylpyrimidine) and neem (a non-edible oil seed obtained from Azadirachta indica) cake. Whereas untreated urea and IBDU hydrolysed rapidly leaving no trace of urea-N after 2 weeks, sulphur-coated urea mineralized quite slowly and retained urea-N for as long as 4 weeks after incubation. Urea blended with neem cake was intermediate. Of all the materials tested, sulphur-coated urea showed maximum nitrification inhibition. A combination of one third sulphur-coated urea at planting + two thirds ordinary urea 30 days later yielded 12·3% more maize grain than ordinary urea in the same proportion at the same times of application.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 93 , Issue 3 , December 1979 , pp. 623 - 627
Copyright
Copyright © Cambridge University Press 1979

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