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THE VISUAL ESTIMATION OF PASTURE AVAILABILITY USING STANDARD PASTURE CORES
Author(s) -
Hutchinson K. J.,
McLean R. W.,
Hamilton B. A.
Publication year - 1972
Publication title -
grass and forage science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.716
H-Index - 56
eISSN - 1365-2494
pISSN - 0142-5242
DOI - 10.1111/j.1365-2494.1972.tb00682.x
Subject(s) - pasture , coring , sampling (signal processing) , estimation , environmental science , regression , grazing , statistics , computer science , mathematics , agronomy , agricultural engineering , biology , computer vision , drilling , mechanical engineering , management , filter (signal processing) , economics , engineering
A coring technique (6), that may be used for estimating the mean amount of herbage on closely grazed pastures, has been adapted to include visual scoring. Two methods are described, both of which use sets of pasture cores from the sward as reference standards. The observers score the herbage on view at random sites against the standards. In the first method the scores are converted to herbage yields directly by reference to the yields of the standards. In the second method a double sampling regression technique is used and the set of standards is used as a visual guide only.