VARIATION MODEL OF SOME FRUITS BIOMETRIC PARAMETERS IN RELATION TO APPLE TREES PHYSIOLOGICAL INDICES

Abstract

The study analyzed the variation of some biometric parameters of apple fruits, the 'Generos' variety, in relation to physiological indices, under the influence of foliar fertilizers. The experiment included 9 experimental variants, a control variant (T1) and 8 fertilized variants (T2 - T9) with foliar fertilizers: Foliarel combined with Uwafol, Waterfert, Biocomplex, Megafol and Calcium chloride. Fruit diameter (FD) and fruit weight (FW) were analyzed in relation to leaf area (LA) and chlorophyll content (Chl). The regression analysis facilitated the obtaining of mathematical models that described FD and FW variation in relation to LA and Chl, in statistical safety conditions. The optimal values for LA and Chl were determined and graphical representation of the FD and FW variation in relation to LA and Chl, in the form of isoquants, were generated. Based on PCA, PC1 explained 87.947% of variance, and PC2 explained 11.39% of variance. Grouping of variants based on affinity, under conditions of Coph.corr = 0.981, were obtained. According to similarity and distance indices (SDI), the highest affinity was recorded for T3 and T9 variants (SDI = 0.3027).