¹⁵N Natural Abundance Evidences a Better Use of N Sources by Late Nitrogen Application in Bread Wheat.

Concerning the 15 N isotope composition, as observed by other authors ( Kolb and Evans, 2003 ) a decreasing trend of δ 15 N values within the different plant organs was observed as lifecycle draws on, decreasing in the non-fertilized plant organs from a mean 6‰ at GS36 and GS60 to 3.5‰ at GS90 and from a mean 4‰ to 2‰ in the fertilized plants ( Figure 2 ).

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The N concentration of vegetative organs (fourth and flag leaves) showed a trend to diminish along the wheat crop lifecycle ( Figure 2 ).

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