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This article in AJ

  1. Vol. 58 No. 3, p. 245-249
    Received: Apr 29, 1965

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A Physiological Effect of Nitrogen on Phosphorus Absorption by Corn1

  1. F. S. Leonce and
  2. M. H. Miller2



A series of soil and solution experiments were conducted to study the mechanism responsible for the increased P absorption which occurs when N is added to a P fertilizer band.

The addition of (NH4)2SO4 or NH4Cl to a pellet P-32 labelled, concentrated superphosphate placed 0.5 inch to the side of a corn root greatly increased the labelled P content of the plant tops. The addition of KNO3 reduced the P content of the tops when compared to concentrated superphosphate only. When the pellets consisted of phosphate only or phosphate plus KNO3, labelled P accumulated to high levels in the root as revealed by autoradiographs. No such accumulation occurred in the presence of NH4+ ions.

The addition of NH4NO3 to a nutrient solution increased the transfer of P through a 1-inch segment of a corn root exposed to the solution, but did not influence the accumulation in the root.

It was concluded that the NH4+ ion has a specific influence on the transfer of P across the root symplast to the xylem.

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