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Development of methods for remotely sensing grass growth to enable precision application of nitrogen fertilizer

Published online by Cambridge University Press:  01 June 2017

P.M. Berry ,
H.F. Holmes  and
C. Blacker
P.M. Berry*
Affiliation:
ADAS High Mowthorpe, Duggleby, Malton, N Yorkshire YO178BP, UK
H.F. Holmes
Affiliation:
ADAS Boxworth, Boxworth, Cambridge CB234NN, UK
C. Blacker
Affiliation:
Precision Decisions, Shipton by Beningbrough, York, North Yorkshire, YO301BS, UK
*
† E-mail: pete.berry@adas.co.uk
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Abstract

A ‘chessboard’ field experiment set up to investigate how the yield response to nitrogen (N) fertiliser varied spatially within a field in the UK indicated that the optimum N rate varied substantially by up to 100 kg N/ha within the three hectare experimental area. Variation in N optima was negatively related to the soil N supply. However, soil N supply, yield potential and apparent fertiliser recovery rate were inter-related which meant that the influence of each element on N optima was complex. Spectral reflectance indices related well to crop N uptake and could be used to help estimate soil N supply.

Keywords

grassnitrogen fertiliseroptimum fertiliser ratevariable rate technology

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References

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