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Nitrogen Uptake by Ladino Clover-Orchardgrass Pasture Under Irrigation as Influenced by Moisture, Nitrogen Fertilization and Clipping Treatments¹

Synopsis: On shallow Ephrata fine sandy loam soil, the nitrogen uptake in the grass and clover was greatest from midsummer irrigation at 7- to 11-day frequency and 12-inch clipping height than a longer frequency and less height. Total nitrogen uptake increased in the grass and decreased in the clover with increased nitrogen fertilizer rates. The clover supplied 99 pounds of nitrogen per acre to the grass when no fertilizer nitrogen was applied. The nitrogen in the grass, other than that from fertilizer nitrogen, increased in relationship to clover yields.

² Agronomist and Soil Scientist, respectively, Western Soil and Water Management Section, U.S.D.A., Irrigation Experiment Station, Prosser, Washington.

Received for publication August 17, 1956.