عنوان مقاله [English]
Field experiment was carried out as split-plot based on randomized complete block design with three replications in 2017, to evaluate physiological and morphological performance and oil yield of coriander, in response to water limitation and foliar application of zinc. Treatments were four levels of water supply (irrigation after 70, 100, 130 and 160 mm evaporation from class A pan) and three levels of zinc foliar application (control (foliar application of water), foliar application of zinc with 3 g ZnSo4/L (Zn1) and foliar application of zinc with 6 g ZnSo4/L (Zn2)).Irrigation and foliar application treatments were allocated to main and sub plots, respectively. Decreasing water availability resulted in decreasing leaf relative water content and chlorophyll content. However, proline content of leaves enhanced under limited irrigation conditions. Mean leaf chlorophyll content significantly enhanced by exogenous spray of zinc with 6 g ZnSo4/L, compared with control. Decreasing water supply led to reduction in plant height, stem diameter, number of leaves per plant and grain yield. Foliar application of zinc with 6 g ZnSo4/L caused significant increase in plant height and grain yield. Oil percentage in the grains of coriander increased as a result of water deficit, but grain oil yield decreased with increasing irrigation intervals. Oil yield significantly enhanced by foliar application of zinc with 6 g ZnSo4/L. There was no significant difference between 3 and 6 g ZnSo4/L foliar application of zinc.This would become more important under conditions where water availability is limited.
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