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This article in AJ

  1. Vol. 62 No. 6, p. 753-758
    Received: Feb 27, 1970

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Effects of Ammonium on the Uptake of Phosphorus, Sulfur, and Rubidium by Corn1

  1. C. P. Mamaril and
  2. M. H. Miller2



Four controlled environment experiments were conducted to further elucidate the influence of NH4+ on P absorption and to determine if this phenomenon is specific only to P.

specific only to P. The variables investigated were concentrations of P and NH4+, proportion of soil treated, and proportion of root system exposed to treated soil. In one experiment 35S labelled (NH4)2SO4 and K2SO4 were applied to determine the effect of NH4+ on SO4= absorption. In another experiment 86RbCl was added as well as 32P labelled phosphate to determine whether the absorption of cations would be increased by NH4+ as is that of P.

Concentration of P in the soil rather than the proportion of soil treated or the proportion of the root system exposed to the treated soil determined the influence of NH4+ on P absorption. The effect of NH4+ increased with increasing concentration of NH4+. The absorption of SO4= and Rb+ were not influenced by NH4+ to the same degree as was absorption of P.

With the exception of one experiment, the effect of NH4+ on P absorption was much less pronounced than reported previously. The reason for this difference cannot be adequately explained.

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