Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 April 1957
Published in Agron J 49:190-193 (1957)
© 1957 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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The Constituent Differential Method of Estimating Species Composition in Mixed Hay1

C. S. Cooper2, D. N. Hyder2, R. G. Petersen3 and F. A. Sneva2

Synopsis: A method is presented for determining the species composition by weight of a two-component forage mixture when the two components contain different concentrations of a given constituent. It consists of measuring the constituent concentration of a large sample from each plot and the species components from small samples taken at random from plots treated alike. Species composition of the large sample is then computed using appropriate formulae. The use of dry matter, calcium and crude protein to estimate botanical composition was investigated. The method was found to be more efficient than hand separation.

1 Contribution from the Squaw Butte-Harney Range and Livestock Experiment Station, Burns, Oregon, which is jointly operated by the A.R.S., U.S.D.A. and Oregon Agr. Exp. Sta., Oregon State College, Corvallis, Ore. Technical paper No. 1003.

2 Agronomist, Range Conservationists, respectively, Field Crops Research Branch, A.R.S., U.S.D.A.

3 Statistician, Oregon State College. Corvallis, Ore.

Received for publication October 8, 1956.




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Copyright © 1957 by the American Society of Agronomy.