The Dependence of the Peach Productivity on the Biological Cultivar-Related Specifics and on the Natural and Climatic Conditions on the Crimean Southern Coast

Abstract

Aim. The aim of the research was to construct the regressive model of productivity of peach cultivars. The model should allow an objective evaluation of interrelation between yield and biotic / abiotic limiting factors under conditions of the Crimean Southern Coast. Methods. The research has been conducted in 1990 - 2018 under conditions of the Crimean Southern Coast by using collection plantings of Nikita Botanical Gardens. The research on cultivars have been conducted in line with conventional techniques. The data preparation, the correlation and the regression analysis have been based on the works of N. Bublik, and V. Gorina, as well as the package "Statistika 6". Results. The multiple regression equations of relationship between yield and researched factors were constructed, the multiple regression (R) as well as the multiple determination (R²) coefficients, determining the fraction of the yield variability under influence of relevant factors, have The most significant correlations between yield and external factors were identified for each cultivar. been determined. Main Conclusions. The peach yielding capacity was, according to the cultivar, essentially influenced by the air temperatures during the blossom (r = 0.54) and by degree of the setting of reproductive buds (r = 0.31). The infestation of plants with powdery mildew, leaf curl and shothole disease led to reduction of yields (r = -0.52, -0.46, -0.42, respectively). A negative correlation between the yield capacity and the relative humidity (r = -0.38), as well as the precipitation value during the blossom (r = -0.38) was identified. The maximal trait regression coefficients (from 28.7 to -52.6) were shown by the cutivar Yunnat and the minimal ones (from 2.28 to 3.22) - by the cultivar Golden.