الفهرس 
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Abstract
Abstract
This study was carried out during two successive seasons (2017 and 2018) on four Citrus rootstocks namely: Volkamer lemon (C. volkameriana), Sour orange (C. aurantium ), Trifoliate orange (C. Trifoliata) and Balady lime (C. aurantifolia) grown in Faculty of Agriculture, farm, Banha, Qaliubiya governorate _ Egypt to study the effect of some mineral fertilization treatments ( N, K, and Mg) on vegetative growth, nutritional status and spectral signature of these citrus seedlings rootstocks besides some vegetation indices (VIS) particularly three tested ones in this study i.e 1- (NDVI), 2- (MCARI), 3- (NDNI) were generated as they are directly related to the (plant photosynthetic activity, surface water, leaf area index and amount of biomass), leaf chlorophyll and nitrogen contents respectively. Therefore a real prediction for these measurements could be safely obtained. Results revealed that, nitrogen treatment, especially the higher level of it, has led to significant increase in all vegetative growth parameter, as well as the leaf content of macro and micro nutrients in all rootstocks. The treatment with magnesium and potassium also resulted in a noticeable increase in the various vegetative growth parameters, as well as the leaves macro and micro elements of all four rootstocks were increased over the control treatment. The fertilization treatments of all four citrus rootstocks affected also the spectral properties of their leaves, as well as three vegetation indices (VIS): normalized difference vegetation index (NDVI), normalized difference nitrogen index (NDNI) and modified