Evaluation of nutritional status of kiwi vineyards in Guilan province using ‎Compositional Nutrient Diagnosis (CND) method

In order to evaluate the nutritional status of kiwi vineyards (Actinidia deliciosa ‘Hayward’) in Guilan province by multiple diagnosis (CND) method, 40 vineyards in two years (2018-2019) were surveyed. The leaf samples from the dominant variety (Hayward), from 30 vines and 10 leaves in four different geographical directions, (total of 100 leaves) in each vineyard were collected in August. The vines have been over ten years old in the east (Roodsar) and west (Talesh) of Gilan province. Then concentrations of nutrients B, Cu, Zn, Mn, Fe, Mg, Ca, K, P and N were determined In this study, using the cumulative function model of variance ratio of (Fic (Vx) nutrients, multiple detection method and solving the equations of the third degree cumulative function related to nutrients, the average yield of 37.5 (ton/ ha) was determined as a separator between high and low yield groups. The results showed that there is a significant difference between high and low yield orchards in terms of nutrient concentrations. From the mean numbers of nutrients for the high-yield population, the desired concentrations of the 10 elements were obtained, including nitrogen 2.64 ± 0.28%, phosphorus 0.26±0.06% , potassium 1.62 ±0.58 %, magnesium 0.31 ± 0.08%, calcium 2.33 ±0.26 %, manganese 71 ± 0.0047 mg/kg, copper 14 ± 0.001 mg/kg, iron 173±0.00330 mg/kg, zinc 28±0.0006 mg/kg and boron 55±0.0029 mg/kg. According to the resulting norms, the frequency of elements deficiency of boron, manganese, nitrogen, phosphorus, copper and potassium was more than 50%, respectively.