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This article in AJ

  1. Vol. 68 No. 1, p. 17-19
     
    Received: Apr 26, 1975


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doi:10.2134/agronj1976.00021962006800010005x

Nitrogen Uptake Characteristics of Corn Roots at Low N Concentration as Influenced by Plant Age1

  1. J. H. Edwards and
  2. S. A. Barber2

Abstract

Abstract

Information is needed on the relation between concentration of N in solution, CN, and the rate of N uptake by corn (Zea mays L.) roots in order to evaluate the soil and crop parameters affecting N fertilizer efficiency. Data on net N influx, In, vs. CN were obtained for N levels below 150 μM on corn plants of seven ages ranging from 15 to 58 days (2 weeks after tasseling). In was determined by measuring rate of N depletion from the solution in which corn plants grew. Both NH+4 and NO-3 forms of N were used. The experiments were conducted in the growth chamber and greenhouse.

Maximum influx, In-max, occurred above 21 μM N concentration. Values of In-max, varied with plant age and were greatest with 18 to 24-day-old plants and decreased exponentially to 58-day-old plants. In ceased when the averaged CN value decreased to 4 μM. This minimum N concentration varied little with plant age. Since the range of CN values where In varied was only 4 to 21 μM, the tune period when CN is within this range for corn growing in the field is probably short so In will usually be at either In-max or 0.

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