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Effects of foliar-applied nitrogen fertilizer on oilseed rape (Brassica napus)

Published online by Cambridge University Press:  23 October 2013

C. A. WHITE ,
S. E. ROQUES  and
P. M. BERRY
C. A. WHITE*
Affiliation:
ADAS, Gleadthorpe, Netherfield Lane, Meden Vale, Mansfield, Nottingham, NG20 9PD, UK
S. E. ROQUES
Affiliation:
ADAS, Boxworth, Cambridge CB23 4NN, UK
P. M. BERRY
Affiliation:
ADAS, High Mowthorpe, Malton, North Yorkshire YO17 8BP, UK
*
*To whom all correspondence should be addressed. Email: [email protected]
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Summary

The aim of the present study was to evaluate the effects on yield, oil concentration and nitrogen (N) uptake efficiency of N fertilizer applied to the foliage of oilseed rape during and soon after flowering. Four field experiments were conducted in the UK during the 2008/09 and 2009/10 seasons which investigated six rates of soil-applied N (ammonium nitrate) ranging from 0 to 280 or 320 kg N/ha with each treatment followed by 0 or 40 kg/ha of foliar N applied as a solution of urea at the end of flowering. Each experiment also investigated five rates of foliar N ranging from 0 to 120 kg N/ha applied at the end of flowering and five timings of foliar N (40 kg N/ha) from mid-flowering to 2 weeks after the end of flowering.

Foliar N at 40 kg N/ha applied at the end of flowering significantly increased the seed yield in three of the four experiments. The seed yield increase across all four experiments was 0·25 t/ha (range of 0–0·41 t/ha). In two experiments, the increase in seed yield in response to foliar N occurred irrespective of whether it followed sub-optimal or super-optimal rates of soil-applied N; in one experiment there was a greater response at sub-optimal soil-applied N rates. The foliar N treatment reduced the seed oil concentration by 11 g/kg and increased seed protein concentration by 11 g/kg. Similar yield responses were observed for foliar N applications between mid-flowering and 2 weeks after the end of flowering. The efficiency with which foliar N was taken up into the plant varied between 0 and 100% with an average uptake efficiency across the four experiments of 61%.

Type
Crops and Soils Research Papers
Information
The Journal of Agricultural Science , Volume 153 , Issue 1 , January 2015 , pp. 42 - 55
Copyright
Copyright © Cambridge University Press 2013 

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