Biochemical and chemical composition of strawberry fruits (Fragaria x ananassa Duch.) when cultivated with drip irrigation and fertigation on so d-podzolic soil

One of the important indicators of the quality of berry production is the fruit biochemical and chemical composition. The nutritional value of strawberry is determined as the content of sugars, acids, vitamins and elemental composition. Objective of study : to establish the fertilizer impact on the biochemical and chemical composition of strawberry fruit, to determine variety characteristics, to identify the relationship between the content in fruits and leaves of macronutrients and biochemical parameters of fruits. Materials and methods : the object of research were strawberry plants of Honeoye and Troitskaya varieties, doses of mineral fertilizers and methods of their application. In the work we used refractometric, complexometric and titrimetric methods of analysis of plant samples, determination of the main macronutrients in one sample effected by the method of wet salting of plant material, methods of statistical data analysis. Results: the article presents the results of chemical analyses of fruits and leaves and statistically significant correlation coefficients with the quality of strawberry fruit, on average for three years of research. Conclusions: the change in the chemical composition of plants is more influenced by the characteristics of the variety, in less - by the doses and methods of applying mineral fertilizers, including fertigation. According to three-year observations, a rather high positive correlation was observed between the content of sugars and solids in fruits and between the content of magnesium in leaves and calcium in fruits (r =0.74 and 0.82). A negative correlation was observed between the content of dry matter in fruits and magnesium content in leaves (r= -0.68), calcium content in fruits and sugar content (r= -0.69).