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Effect of Split Application on N Uptake by Wheat from N15 Labelled Ammonium Nitrate and Urea

Published online by Cambridge University Press:  03 October 2008

A. Hamid  and
G. Sarwar
A. Hamid
Affiliation:
Nuclear Institute for Agriculture and Biology, Lyallpur, Pakistan
G. Sarwar
Affiliation:
Nuclear Institute for Agriculture and Biology, Lyallpur, Pakistan
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Summary

The effect of split application of N on the uptake of N by wheat from N15 labelled ammonium nitrate and urea was studied in the field. Nitrogen fertilizers were applied at 120 kg N/ha in a single application (at seeding); two split applications (at seeding and tillering); and six split applications (at seeding, tillering, boot, heading, flowering and the milky stage). Nitrogen applied in two splits was most productive for grain yield for both the N sources, but six split applications significantly increased the protein content in grain compared with single or two split applications. The utilization of N from ammonium nitrate in grain was significantly higher than from urea when applied in six split applications.

Type
Research Article
Information
Experimental Agriculture , Volume 12 , Issue 2 , April 1976 , pp. 189 - 193
Copyright
Copyright © Cambridge University Press 1976

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