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Agronomy Journal Abstract -

Concentrations of N and P in Young Corn Plants, as Affected by Various Growth-limiting Factors1


This article in AJ

  1. Vol. 64 No. 3, p. 384-388
    Received: Oct 21, 1971

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  1. G. L. Terman,
  2. J C Noggle and
  3. O. P. Engelstad2



Yields and concentrations of N and P were studied in young corn (Zea mays L.) plants as a basis for correct interpretation of plant analysis results. The corn was grown on soils deficient in these nutrients in several greenhouse pot experiments comparing rate, source, and placement of N or P. Results from such pot experiments were satisfactory for establishing minimum and critical nutrient concentrations in corn if various growth-limiting factors were properly corrected. These included age of plant, application rates of one or more deficient nutrients, and adequacy of other yield-limiting factors, including liming and other nutrients.

The minimum concentrations of total N or of P in corn forage appear to be rather constant for a given age of plant and can be more accurately estimated than critical concentrations can. The results suggest the estimation of critical values from the minimum concentrations.

C-type curves resulting from plots of dry matter yield vs nutrient concentration could be explained largely by dilution resulting from growth response to application of a second deficient nutrient.

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