UTILIZATION OF PHOSPHORUS BY POTATOES

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Abstract
Phosphatic fertilizers labeled with P32 were used at rates of 0, 50, 100 and 200 lbs. of P2O5 per acre on Long Island and 0, 25, 100 and 200 lbs. of P2O5 per acre in N. Carolina. The Green Mt. var. was grown on Long Is. and Irish Cobbler in N. Carolina on soils having high and low native P content in each location. Plant samples were taken at 4 stages of growth and analyzed for total P content as well as for % of radioactive P. The % of P in the plant derived from the fertilizer increased as the rate of appln. increased. The potato plants contained a higher proportion of fertilizer P when grown on soils low in native P than when grown on soils high in P. As the rate of applied P increased the number of lbs. of P2O5 absorbed from the fertilizer increased. In neither Long Is. or N. Carolina did levels of soil P greatly affect the amt. of P2O5 absorbed from the fertilizer. The total amt. of P2O5 absorbed, however, was greatly affected by soil level. The % of applied P utilized was very low. At the 100-lb. rate the values ranged from 4.2 to 14.5% in the 4 expts.

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