Effect of Irrigation Duration and Rootstock on Concentration of some Nutrient Elements in Young  Thomson Navel Orange Leaves

In this study، effect of irrigation duration on concentration of some macro and micro nutrient elements in ‘Thompson Navel’ orange leaves grafted on three rootstocks was evaluated as a factorial experiment in completely randomized block design. Factors included rootstocks in three levels (Poncirus trifoliata، Citrus aurantium and Troyer citrange (Citrus sinensis ´ Poncitus trifoliata)) and irrigation durations in four levels (2، 4، 6 and 8 days). The results showed that rootstocks and irrigation duration can significantly affect scion leaf nutrient elements concentration. With irrigation of two days intervals، the differences among citrus rootstocks for nutrient elements absorption was significant. In two days interval of irrigation (no stress)، significantly higher copper concentrations by sour orange، potassium concentrations by poncirus and phosphor، nitrogen، iron and zinc by Troyer citrange rootstocks were absorbed as measured in ‘Thompson Navel’ leaves. In 8 days interval irrigation treatment، significantly higher copper and zinc concentrations by sour orange، nitrogen and potassium concentrations by poncirus and phosphor by troyer citrange rootstocks were measured in ''Thompson navel'' leaf as a scion. Overall، all rootstocks used in this study، that are common citrus rootstocks in the North of Iran، did not show any preference in nutrient element absorption at drought stress conditions.