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Partitioning of biologically fixed nitrogen in cowpea during pod development

L.A. DOUGLAS and R.W. WEAVER
Plant and Soil
Vol. 116, No. 1 (May (I), 1989), pp. 129-131
Published by: Springer
Stable URL: http://www.jstor.org/stable/42937876
Page Count: 3
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Partitioning of biologically fixed nitrogen in cowpea during pod development
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Abstract

Two days after exposure of roots to ¹⁵N labeled N₂, partitioning of biologically fixed N into leaves, stems, peduncles, pods, roots and nodules was measured in the early pod development stage of cowpea (Vigna unguiculata (L.). The experimental objective was to determine the quantity of biologically fixed N that is incorporated into vegetative tissue before being mobilized to pods. For the three varieties of cowpea included in the experiment a maximum of 50% of the N, biologically fixed two days earlier, was contained in the pods. The remaining N was distributed throughout the vegetative portion of the plant with at least 30% in stems and leaves which indicates that much of the newly fixed N must cycle through a N pool in these tissues before reaching the pods.

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