Concentrations of N and P in Young Corn Plants, as Affected by Various Growth-limiting Factors1
- G. L. Terman,
- J C Noggle and
- 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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