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University of Arizona (1990)

Seasonal variation in utilization estimates on sideoats grama plants

DeMuth, Carol Ann

Titre : Seasonal variation in utilization estimates on sideoats grama plants

Auteur : DeMuth, Carol Ann,

Université de soutenance : University of Arizona

Grade : Doctor of Philosophy (PhD) 1990

Résumé
The variability in utilization estimates using seasonal production data from clipped sideoats grama plants was studied in southeastern Arizona. Three intensities of clipping at four seasons were studied. Regrowth was also examined. Current growth was highest in October and lowest in June, whereas, standing dead material was lowest in February and highest in June. By April 1986, 39% of peak current growth was already produced. Total peak standing crop occurred in October. The sum of current growth and regrowth from heavy clipping was greater than for plants clipped heavily only in October. The opposite was true for moderate and control clippings. Actual utilization was calculated using peak current growth as a basis for calculating percentage utilization. Relative utilization was based on standing crop at each season of clipping treatments. Generally, relative utilization estimates overestimated utilization when compared to actual utilization estimates based on current growth.

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