Assessment of leaf secondary macronutrient variability in olive cultivars grown on shale and sand stone derived soils
Author(s) : Anum Farhat, Muhammad Fahad Irfan, Mavia Murad, Muhammad Umer Afzal
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The awareness of Calcium (Ca) and Magnesium (Mg) variation in olive is pertinent for healthy plant growth. The aim of this research was to examine the seasonal variation of Ca and Mg contents in olive leaves. A field study was conducted for one year at University Research Farm, Chakwal, Pakistan. Leaf nutrients were measured on monthly basis during 2017 growing season. Six olive varieties BARI Zaitoon-1, PS-1, VP-1, Balkasar, Moraiolo and Chitina were selected. Preliminary soil sampling was done for evaluation of fertility status, soil texture, soil pH, EC, total organic matter, CaCO3, NO3-, available P, extractable K+, soluble Ca, Mg and Ca were analyzed initially. Soil was categorized as alkaline having no salinity issue and it was found weak to moderate calcareous, soil texture was sandy loam to loam. Organic Matter was less. The study revealed that there was deficient N, P whereas K, Ca and Mg were adequate in olive orchard. In olive, highest Ca peaks were noticed in summer season during the initiation of leaf development. The varietal comparison revealed that Ca concentration in each olive variety was above the sufficient level. In winter highest Mg peaks were noticed from fruit growth to the end of dormancy. There was no Mg deficiency among olive cultivars. The results recommend that there is further need to sample flower or fruits to understand the nutrient status of orchards.