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Synopsis: Urea-N increased production of timothy approximately 5-fold, irrespective of depth of water table and soil. Yields were about the same with water tables maintained at 2.5, 15, or 46 cm. as without a water table. Greatest yield occurred in lysimeters with 46 cm. of soil, 46-cm. water tables, and N fertilizer. Within 2 years, Juncus balticus completely dominated nonfertilized timothy growing with 2.5 or 15-cm. water tables. Formation of moss and a sod mat on the soil surface coincided with the appearance of Juncus.
2 Soil Scientist, USDA, and Associate Agronomist, Colorado State University; Soil Scientist, USDA; and Agricultural Engineer (deceased), USDA; respectively, Grand Junction, Colorado.
Received for publication December 17, 1964.
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