Comparative Study of DOP and CND Methods for Leaf Nutritional ‎Diagnosis of Vitis Vinifera in Iran

ABSTRACT

In this study, the norms for Vitis Vinifera have been derived and compared using the Compositional Nutrient Diagnosis (CND) and Deviation from Optimum Percentage (DOP) diagnose methods to determine the nutrient deficiency in Vineyards at Central Alborz region, Iran. A total of 200 leaf samples were collected during two years from Vitis Vinifera trees and nutrient concentrations of Mn, Zn, Fe, Mg, Ca, K, P, N, B, and Cu were measured. The results showed that there are differences between DOP and CND diagnosis methods. According to mean DOP indices for nutrient elements, the priority of the deficiency of elements was as follows: Mn > P > Ca > Fe > Cu. In addition, the CND standard norms were determined as F^c_i(V_N) = 32.34, F^c_i(V_P) = 34.49, F^c_i(V_K) = 48.58, F^c_i(V_Ca) = 54.39, F^c_i(V_Mg) = 64.11, F^c_i(V_Mn) = 19.71, F^c_i(V_Zn) = 47.64, F^c_i(V_Fe) = 53.32, F^c_i(V_Cu) = 32.44, F^c_i(V_B) = 41.59, and F^c_i(R_d) = 39.19 ton.ha⁻¹. The results also showed that there is the deficiency of manganese, nitrogen, iron, and phosphorus in vineyards. Therefore, the field observations due to the implications of apparent deficiencies of nutrient elements in the gardens of the region are more consistent with the DOP method.

KEYWORDS:

• Grape vines
• leaf
• nutritional diagnosis