Annual and residual urea nitrogen contribution to the nutrition of peach trees (Prunus persica L.) grown under subtropical climate

Nitrogen (N) fertilizers such as urea are applied to peach orchards worldwide whenever the soil cannot meet plants’ N demand. However, actual nutritional contribution of different supply modes crops, or residual in subsequent cycle, is yet be fully known. The current study aims assess annual and nutrition trees grown under subtropical climate. Forty kilograms per hectare supplied enriched (3.0 at. % 15N), were full production at a single rate (100 budding) split two rates (50 budding 50 flowering). Total 15N concentrations application year after treatments assessed leaves throughout fruits (pulp stone) harvest stratified samples. 15N, total dry mass measured perennial tree organs treatment application. Peach evidenced higher deriving from fertilizer (NDFF) was soil, well following when into rates. highest NDFF amounts recorded observed (annual organs) thick roots (perennial organ), mainly splitted. its application, due small N, found derived sources other than fertilizer; this justifies applications, necessary. cultivation cover crops preservation organic matter could help that seems take advantage more on fertilizers.