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Use of NIR to estimate clover content of grass swards in NL trials - Year 2 - VS02010

A pilot project collected NIR spectral data from samples in NL trials. These data, in conjunction with data from botanical separation of harvested product from the same plots, were used to generate NIR calibrations for the prediction of % clover in grass/clover mixtures.The calibrations produced gave standard errors of prediction in the range 8.1 to 9.0 and R2 in the range 0.7 to 0.75. In addition to these calibrations, samples were predicted and results were collated to check that the overall rankings of varieties with respect to % clover in the sward were identical between NIR and botanical methods.
The purpose of this second year is to demonstrate that:
1. the predictive power reported above can be sustained over seasons.
2. milling at a range of sites does not detract from the utility of the method.
3. the data obtained for varieties at specific sites and cuts is useful for decision making purposes.
This will release labour at regional centres at periods of peak labour demand and allow a net increase in cost effectiveness in delivering the NL testing programme.
The increased emphasis on sustainable agriculture and in reduced nitrogen inputs in NVZs, clover’s leguminous nitrogen fixing will stimulate interest in clover as a component in swards.
Project Documents
• Final Report : Use of NIR to estimate clover content of grass swards in NL trials - Year 2   (3491k)
Time-Scale and Cost
From: 2004

To: 2005

Cost: £6,000
Contractor / Funded Organisations
National Institute of Agricultural Botany
Plant Varieties and Seeds              
Plants and Animals              
Variety Testing              
Fields of Study
Plant Varieties and Seeds