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Proportionate Uptake of Soil and Fertilizer Phosphorus by Plants as Affected by Nitrogen Fertilization: II. Field Experiments with Sugar Beets and Potatoes¹

ABSTRACT

Field experiments were conducted in North and South Dakota, with sugar beets and potatoes grown under irrigation, to determine the effect of nitrogen fertilizer additions on the relative availability of soil and fertilizer phosphorus to plants. The addition of nitrogen fertilizer generally increased the percent of the total phosphorus absorbed by plants from bands of concentrated superphosphate. The percent of the total plant phosphorus derived from the fertilizer tended to decrease later in the season.

Detailed studies with sugar beets at one location indicate that the percent of the total plant P coming from the fertilizer tended to increase with plant growth.

¹ Contribution from the Agricultural Research Service, U.S.D.A., and the South Dakota Agr. Exp. Sta., cooperating. Published with the approval of the Director as Paper No. 358, Journal Series, South Dakota Agr. Exp. Sta.

² Soil Scientists, Western Soil and Water Management Section, S.W.C.R.D., A.R.S., U.S.D.A.

³ Soil Scientist, Western Soil and Water Management Section, S.W.C.R.D., A.R.S., U.S.D.A., and Agronomist, South Dakota Agr. Exp. Sta.

⁴ The authors wish to acknowledge the assistance of C. E. Evans, S. R. Olsen, and L. B. Nelson in experimental planning. Joseph Alessi and L. R. Jensen assisted in field operations. S. H. Shih and R. Y. Yamaga assisted in laboratory analyses. Experimental areas were furnished by the Bureau of Reclamation.

Received for publication August 31, 1957. Accepted for publication September 12, 1957.