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The Effects of Nitrogen on Short-Term Phosphorus Absorption and Translocation in Corn (Zea Mays)¹

ABSTRACT

Short-term P uptake studies were conducted with intact 1-month-old corn plants of differential N and P composition. Supplemental N pretreatments producing increased growth rates and higher levels of N in the plant stimulated the rate of P uptake per unit dry weight of root more than did a tenfold increase in P concentration in the external solution. Nitrogen pretreatments caused five- to tenfold increases in rate of P translocation to the tops during the uptake period. The presence of nitrate or ammonium ions in the test solution during the uptake period had negligible effects on P uptake rates. Phosphorus uptake rates were highly correlated with total N level in the roots. The stimulation of P uptake rates with higher plant N levels suggests a connection between N metabolism and P uptake processes.

¹ Contribution from the Soil and Water Conservation Research Division, ARS, USDA, and the Colorado Agr. Exp. Sta. Presented before the Western Society of Soil Science, Davis, Calif., June 22, 1961.

² Soil Scientists, USDA, Fort Collins, Colo., Mandan, N. Dak., and Fort Collins, Colo., respectively.

Received for publication January 16, 1963. Accepted for publication April 22, 1963.