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Influence of sowing date on the uptake of and responses to soil and fertilizer nitrogen by the spring wheat cultivar Tonic

Published online by Cambridge University Press:  27 March 2009

J. Webb ,
R. Sylvester-Bradley  and
J. D. Wafford
J. Webb
Affiliation:
ADAS Rosemaund, Woodthorne, Wolverhampton WV6 8TQ, UK
R. Sylvester-Bradley
Affiliation:
ADAS Soil and Water Research Centre, Anstey Hall, Marts Lane, Trumpington, Cambridge CB2 2LF, UK
J. D. Wafford
Affiliation:
ADAS Biometrics Unit, Rivershill House, St George's Road, Cheltenham CL50 3EY, UK
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Summary

At 14 sites in the UK, spring wheat (Triticum aestivum) cv. Tonic, was sown on three or four dates at each site between October and March in the 1988/89, 1989/90 and 1990/91 seasons. Responses to spring-applied fertilizer N over the range 0–320 kg/ha were determined. Earlier sowing did not increase uptake of soil N by the crop. Fertilizer N increased grain N offtake by between 25 and 140 kg/ha and yield by between 0·3 and 5·5 t/ha, although grain yield was less responsive to fertilizer N at later sowing dates. Apparent recovery of fertilizer N (AFR) also decreased as sowing was delayed but there was no effect of delayed sowing on the amount of grain produced from each kg of fertilizer N recovered. Because fertilizer N recovery decreased with later sowing, the amount of fertilizer N needed to produce the optimum economic grain yield was not reduced. Neither AFR nor optimum fertilizer (Nopt) was related to optimum yield. Regression of Nopt on the difference between optimum yield and yield without fertilizer N (△y) explained 77% of the variance in Nopt. There was an inverse relationship between △y and soil mineral N (SMN) in spring; regression of △y, on SMN in spring accounted for 29% of the variance in △y Current advisory systems which adjust economic fertilizer N recommendations according to anticipated yield are not justified by these results. Moreover the adjustments made, based on yield expectation, appear about three times as large as those needed to minimize residues of fertilizer N left unrecovered by the crop and to reduce the risk of nitrate leaching in the following winter.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 125 , Issue 1 , August 1995 , pp. 25 - 37
Copyright
Copyright © Cambridge University Press 1995

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