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This article in AJ

  1. Vol. 68 No. 1, p. 107-111
     
    Received: Jan 3, 1975
    Published: Jan, 1976


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doi:10.2134/agronj1976.00021962006800010028x

Yield-Nutrient Absorption Relationships as Affected by Environmental Growth Factors1

  1. G. L. Terman,
  2. F. E. Khasawneh,
  3. S. E. Allen and
  4. O. P. Engelstad2

Abstract

Abstract

Widely varying results and conclusions are reported in the literature concerning the effects of environmental growth factors, especially temperature, on yields of dry matter and nutrient absorption by plants. The purpose of this paper is thus to evaluate the effects of temperature in three greenhouse pot experiments and as reported in the literature on yield-nutrient uptake relationships. Several rates of applied N and P were compared in Exp. 1 for oats (Avena sativa L.) grown for 7 weeks at three combinations of day length and temperature. Several rates of N and P in factorial combination were compared in Exp. 2 for corn (Zea mays L.) grown for 4 weeks at water bath temperatures of 16 and 27 C. Corn was also grown in Exp. 3 for 3 and 6 weeks to compare P rates and temperatures of 16 and 21 C and at ambient temperatures (25 to 35 C). Dry matter yields and uptake of N and (also of cations in Exp. 3) were determined. Plant nutrient concentrations, especially of P, increase with higher soil temperatures in experiments of short duration and with little yield response to temperature. However, with marked yield response, dilution of plant nutrient concentrations but higher uptake are the dominant trends with increase in temperature up to the optimum for each crop species. The reverse usually occurs at temperatures above the optimum. Release of nutrients from the substrate with higher temperatures varies greatly with soil fertility level and amounts of applied nutrients. Rate of root growth is also very likely a predominant factor in plant uptake of nutrients, especially those having limited mobility in the soil.

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