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This article in SSSAJ

  1. Vol. 38 No. 3, p. 455-460
     
    Received: Sept 13, 1973
    Published: May, 1974


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doi:10.2136/sssaj1974.03615995003800030024x

Accretion and Dilution of Nutrients in Young Corn, as Affected by Yield Response to Nitrogen, Phosphorus, and Potassium1

  1. G. L. Terman and
  2. S. E. Allen2

Abstract

Abstract

Hybrid corn (Zea mays L.) was grown in infertile soil fertilized with none and three nonzero rates of N, P, or K in separate treatment series; other nutrients were applied in each series at uniform levels. Near-linear increases in uptake of N, P, or K with amount applied occurred during 25, 41, and 53 days' growth. Concentrations of N, P, or K increased with amount applied and decreased with continued growth in each series; uniformly applied P and K, N and K, or N and P were diluted with increase in dry matter resulting from continued growth and yield response to increasing amounts of the third nutrient. Yield-concentration relationships in the N response series were similar for N, Ca, Mg, Mn, and Zn. Response to P or K resulted in dilution of all other nutrients. Concentrations of total cations increased with concentrations of N in each response series; the reverse was true with P and K. Thus, the results suggest that a positive relationship between dry matter yields and total cations (C), total inorganic anions (A), and C-A depends on whether yield response is due to N or to other growth-limiting factors.

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