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This article in AJ

  1. Vol. 64 No. 5, p. 684-687
     
    Received: Feb 2, 1972
    Published: Sept, 1972


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doi:10.2134/agronj1972.00021962006400050040x

Relationships Between Dry Matter Yields and Concentrations of Zn and P in Young Corn Plants1

  1. G. L. Terman,
  2. P. M. Giordano and
  3. S. E. Allen2

Abstract

Abstract

Yield-Zn or P concentration relationships were studied in corn (Zea mays L.) grown in several greenhouse pot experiments conducted to compare various rates and sources of Zn and P on soils deficient in these nutrients, Such relationships are important in proper interpretation of plant analysis results. The usual result was for corn forage yields to increase at a minimum Zn concentration of 7 to 9 ppm in the dry forage until P or other growth factor became limiting. Then yields leveled off and Zn concentrations increased at sufficiently high levels of applied Zn. Similarly, yields increased at a minimum P concentration near 0.10% until Zn or other growth factor became limiting; P concentrations then increased. Critical concentrations in the dry corn forage were estimated to be about 14 ppm of Zn and 0.14% P.

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