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This article in AJ

  1. Vol. 77 No. 6, p. 859-862
     
    Received: Nov 26, 1984
    Published: Nov, 1985


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doi:10.2134/agronj1985.00021962007700060009x

Nitrogen Partitioning and Redistribution in Nonnodulating Peanut Related to Nitrogen Stress1

  1. A. Selamat and
  2. F. P. Gardner2

Abstract

Abstract

Nitrogen is essential for vegetative and reproductive growth of peanut (Arachis hypogaea L.), and hypothetically plants may become stressed for N especially during fruiting despite effective N2 fixation. The objectives of this study were to determine the effects of N stress during specific fruiting phenophases on N partitioning and fruit growth. Reproductive growth was competitive with vegetative parts in peanut during periods of N stress. In a glasshouse study in 1982, N was completely withdrawn from nonnodulating (M4-2) plants in pots containing silica sand supplied with nutrient solution. The duration of N removal from the medium was more critical than the specific fruiting phenophase in affecting root growth, pod yield, and N redistribution. Nitrogen was redistributed from vegetative parts to pods in the long N stress periods (> 81 days), whereas there was no detectable N redistribution in the control plants or those subjected to short N stress periods. The calculated N distribution index (NDI) showed that pods competed with vegetative parts for N, if the N stress period was long, but competition was not evident during shortstress periods (<30 days). The magnitude of redistribution (NDI) to seeds relative to source was leaves > stems > roots (in that order), the latter resisting redistribution except in stress periods of long duration

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