Comparison of Nutrient Status in Different Olive Varieties with Nutrition Indicators

Olive is an important fruit in Iran, but nutritional disorders result in decreased yield. In this study, the nutrient status leaf samples four different olive varieties in in Lowshan area of Guilan using DOP, DRIS and CND indexes was investigated. The contents of nitrogen (N), phosphorus (P), potassium (K), manganese (Mn), copper (Cu), zinc (Zn), boron (B) and iron (Fe) in leaf samples were determined in samples. Generally by comparing the mean with deviation from optimum percentage (DOP), most olive cultivars showed a deficiency in terms of N and P macronutrients and B and Cu micronutrients. However, the results showed the excess levels of P and Mn. Except for Fe and Zn, nutrient concentrations showed significant differences in different cultivars. Also, comparison of cultivars for nutrient uptake showed that Manzanilla had significant difference with other cultivars and had the highest nutrient uptake. Comparison of DOP, DRIS and CND results showed that different approaches exist in each index for indicating the excess or deficit status of nutrients.