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Seasonal Variation in Composition and Digestibility of Certain Species of Range Bunch Grasses¹

State College of Washington

Abstract

The value of Blue Bunch Grass, as indicated by chemical analysis depreciates very little after maturity under climatic conditions existing at the Washington experiment station at Pullman. The altitude is about 2500 feet.

The study of this grass was undertaken during the year beginning with October, 1930. During the fall and winter months when leaching was most apt to take place, the precipitation was only 8.97 inches, which is considerably below normal. In the spring months of March, April, and May, when most of the growth took place, the precipitation was slightly above average with 6.97 inches for the period. However, the summer was unusually dry, with only 1.37 inches in June and none in July and August. The total precipitation for the year was 17.31 inches, as compared to the 30-year average of 21.31 inches. There might have been more depreciation in value during the fall and winter if the precipitation had been greater.

¹ Published as Scientific Paper No. 245, College of Agriculture and Experiment Station, State College of Washington.