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Fertilizer-Induced Changes in Botanical Composition, Yield, and Quality of Native Meadow Hay¹

Synopsis: High rates of N and P fertilizers and manure changed the botanical composition and increased hay yields from native flood meadows. Rush and sedge composed 62, 54, 12, and 4% of the hay at 0, 200, 400, and 600 lb. N/acre, while grasses composed 20, 44, 88, and 96% with the same rates of N. Yields of hay were significantly increased with N, P, and manure. The treatments had little effect on the crude-protein content in the hay. Increasing rates of N decreased the P content in the forage.

² Research Agronomists, Crops Research Division, ARS, USDA, Burns, Oregon, and Montana State College, Bozeman, Montana, respectively. The junior author was formerly at Burns, Oregon.

Received for publication December 16, 1960.