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Calibration and evaluation of a drop-disc meter for estimating herbage production in ryegrass for silage

, : Calibration and evaluation of a drop-disc meter for estimating herbage production in ryegrass for silage. Departmental Note Scottish Centre of Agricultural Engineering ( 43): 10 pp.

The drop-disc method of estimating herbage dry matter production was evaluated for ryegrass from growth commencement to the silage stage; the latter corresponded to a max. dry matter (DM) mass of almost 7 t/ha. A close linear relationship between disc settlement height and DM mass up to 4-5 t/ha was found for the period when growth was mainly vegetative rather than reproductive.

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