Agronomy Journal Grow Your Career With ASA
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Published online 1 July 1988
Published in Agron J 80:704-706 (1988)
© 1988 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Hill, N. S.
Right arrow Articles by Hoveland, C. S.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Hill, N. S.
Right arrow Articles by Hoveland, C. S.
Agricola
Right arrow Articles by Hill, N. S.
Right arrow Articles by Hoveland, C. S.

Proportionate Allocation of Pasture Subsamples for Laboratory Quality Analysis

N. S. Hill*, S. L. Fales and C. S. Hoveland

Dep. of Agronomy, Univ. of George, 3111 Miller Plant Science Bldg., Athens, GA 30602
Dep. of Agronomy, Pennsylvania State Univ., University Park, PA 16802
Dep of Agronomy, Univ. of Georgia, 3111 Miller Plant Science Bldg., Athens, GA 30602

* Corresponding author.

Chemical analysis of pasture subsamples is an expensive and time consuming process. The objective of this project was to develop a method by which the number of pasture subsamples can be reduced for routing chemical analysis. Pasture sumsamples of pure alfalfa (Medicago sativa L.) or birdsfoot trefoil (Lotus corniculatus L.) were combined into proportionately allocated samples (PA). Laboratory analysis of in vitro dry matter disappearance (IVDMD) and crude protein (CP) were conducted on the subsamples and PA. Numerical averages (NA) and weighted means (WM) were calculated for IVDMD and CP of the subsamples. One subsample was randomly selected (RS) to estimate IVDMD and CP. The NA, PA, and RS were regressed with WM to determine the goodness of fit of the data for each method. Squared correaltion coefficients of the WM (dependent variable) and PA (independent variable) comparison were 0.99 and 0.93 for IVDMD and CP, respectively. The PA reduced sample number to one-sixth of the original sample volume. The PA was an excellent method of reducing sample volume for IVDMD and CP analysis of pure samples of alfalfa and birdsfoot trefoil.

Key Words: In vitro dry matter disappearance • Crude protein • Weighted mean • Numerical average • Random sample • Grazing • Medicago sativa • Lotus corniculatus

Contribution from the Dep. of Agronomy, Univ. of Georgia.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
The SCI Journals Crop Science Vadose Zone Journal
Journal of Natural Resources
and Life Sciences Education		 Soil Science Society of America Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1988 by the American Society of Agronomy.