The Diagnosis of Optimum Levels for Nutrients in Kiwifruit by DRIS Norms

ABSTRACT: To determine DRIS norms for kiwifruit trees, yield and leaf analysis data were collected from kiwifruit vines in mazandaran province (amol, chalous, tonekabon, nowshahr, sari and ramsar) and then assessed in a period of two years (2013 & 2014). Leaf samples were analyzed for N,P,K,Fe,Mn,Zn and Cu. The results obtained were entered into a data bank. Nutrient data were expressed in ratio forms and based on the yield data vines were divided into low and high yielding populations. Mean coefficient of variation (C.V) and Variance (S) of different forms of nutrient expression were calculated for low and high yielding vines and the ratio of variance of low yielding vines to high yielding vines (SB/SA) was also determined. Those forms of nutrient expression from high yielding vines that had highest SB/SA were selected as norms. The norms and ratio between them were obtained as: %N  2/ 30 ، %P  0/14 ، %K 1/ 56 ، Fe  71/ 63 ، Mn  26/ 74 ، Zn  21/9 ، Cu  5/ 47 ppm،  0 / 060 N P ،  0/ 678 N K ،  31/14 N Fe ،  0/ 086 Mn N ،  0/1 0 5 Zn N ،  2 / 37 N Cu ،  511/ 64 P Fe ،  0/ 0 0 5 Mn P ،  39/ 07 P Cu  45/ 91 K Fe ،  0 / 058 Mn K ،  3/ 51 K Cu ،  2 / 67 Mn Fe ،  3/ 27 Zn Fe ،  0 / 8 1 8 Mn Zn ،  0 / 204 Mn Cu ،  0/ 253 Zn Cu ،  3/11 P K ،  0/ 006 Zn P ،  0 / 071 Zn K ،  0 / 0763

DRIS Norms, Kiwifruit, Nutrients, Optimum Level