Youssefi, F; Brown, P.H; Weinbaum, S.A
HortTechnology,
(1999), Letnik:
9, Številka:
4
Publication
It has been proposed that a pool of amino N, whose size is determined by aboveground N demand, cycles in the plant and regulates soil N uptake by exerting an inhibitory effect at the root level. Several experiments were carried out to study this hypothesis in almond trees Prunus dulcis (Mill.) D.A. Webb. Based on the evidence found, there is an association, at the whole tree level, between sap N content and soil N uptake. The data are consistent with the possibility that increased phloem sap amino acids result in decreased uptake of soil N.
