Some Effects of Soil Moisture Regimes and Bulk Density on Forage Quality in the Greenhouse1
- R. O. Gifford and
- E. H. Jensen2
gropyron elongatum, Medicago sativa, Phleum pratense, and Trijolium hybridum were grown in the greenhouse in a soil compacted to bulk densities of 1.34, 1.44, and 1.53 g/cc. Soil water levels of 20 and 40%, 40 and 60%, and 60 and 80% of saturation by volume were employed. Dry matter yields were significantly lower and water use (g water/g dry shoots) was significantly higher for plants grown in compacted soil under the driest moisture regime than when grown under more favorable conditions. Percent crude protein and crude fiber were significantly affected by species, moisture regime, and bulk density. Plants with the lowest crude fiber and highest crude protein content were grown in the most compacted soil under the driest regime. Significant quality differences were found among treatments similar to typical greenhouse conditions. Therefore, greenhouse and other experiments concerned with forage quality may be confounded by soil water conditionsPlease view the pdf by using the Full Text (PDF) link under 'View' to the left.
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