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Residual Effects of Phosphorus Fertilizer on an Eastern Oregon Soil¹

ABSTRACT

In each of three successive years a 6-year rotation (barley-3 years alfalfa-corn-sugar beets) was established on separate plots of Owyhee silt loam treated with 0, 26, 53, 105, and 210 pounds of P per acre and a uniform rate of N. Plots were split in the fifth year for differential N and in the sixth year for P and N treatments.

Yields and removal of P by crops were determined each year. In the sixth year measurements of soluble P in soil, percent P in plant derived from soil P, A-values, and yield and compositional responses of sugar beets to added P fertilizer were employed to evaluate levels of available residual P in soil.

All methods of evaluation indicate that 210 pounds of P were adequate for all crops in the 6-year rotation. Residual P from the 105-pound rate was inadequate for maximum yield of beets. Essentially no residual P remained in the sixth year from the 26- and 53-pound applications.

Accumulation of N by alfalfa was unaffected by initial rate of P. Fertilizer N substantially increased corn yields following 3 years of productive alfalfa.

¹ Joint contribution from Soil and Water Conservation Research Division, ARS, USDA and the Oregon Agr. Exp. Sta. Oregon Agr. Exp. Sta. Tech. Paper No. 1300. Presented before Div. IV Soil Science Society of America, Nov. 18, 1959, at Cincinnati, Ohio.

² Professor of Soil Technology, Pennsylvania State University, formerly Soil Scientist, Western Soil and Water Management Research Branch, USDA and Oregon Agr. Exp. Sta., cooperating, Corvallis, Ore.; Superintendent, Malheur Branch Exp. Sta., Ontario, Ore.; and Agronomist, Southern Oregon Branch Exp. Sta., Medford, Ore., formerly Research Assistant, Malheur Branch Exp. Sta., respectively.

Received for publication August 5, 1960. Accepted for publication October 11, 1960.