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Growth, Water Relations, and Nutritive Value of Pasture Species Mixtures under Moisture Stress

R. Howard Skinner*, David L. Gustine and Matt A. Sanderson

USDA-ARS Pasture Systems and Watershed Management Research Unit, Building 3702 Curtin Road, University Park, PA 16802



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  		Fig. 1. Effect of irrigation treatment on volumetric soil water content at 30 cm below the soil surface. Rainout shelters excluded rainfall from mid-May through early October each year and 560 mm (wet), 420 mm (normal), or 260 mm (dry) water was applied with a drip irrigation system. Data are averaged across species mixtures. Each data point represents the mean of 8 observations.

 


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  		Fig. 2. Total forage yield from 9 May to 4 October 2000 and 19 April to 25 September 2001 for four pasture mixtures. Mixtures included the following species: A) Kentucky bluegrass/white clover; B) orchardgrass/red clover; C) Kentucky bluegrass/perennial ryegrass/orchardgrass/white clover/chicory; and D) Kentucky bluegrass/perennial ryegrass/tall fescue/red clover/narrow-leaf plantain. Water was applied to match the average amount received during the 10 wettest (28 mm wk–1), 10 median (21 mm wk–1), and 10 driest (13 mm wk–1) summers for the 92 years for which precipitation records were available for State College, PA. Data are averaged across stubble heights which had little effect on yield. Each bar represents the mean of 8 observations.

 




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