Owing to its suitable temperature conditions and the hot and dry climate combined with access to water courses and bodies, Sughd Region is a place that is naturally suited to the production of vines. Rational management of fertilizers is one of the key elements of production that makes it possible to obtain an optimal yield of high quality while considering the impact of fertilization on the environment. The aim of the research was to assess differentiation in the fertilization of vines with phosphorus and potassium with reference to the quality and quantity of the yield obtained, and aspects related to fertilization efficiency under the conditions of Sughd Region of the Republic of Tajikistan. The study was conducted in Sughd Region in Tajikistan, from 2015 to 2017. The experiment comprised two factors. The first factor was fertilization, with five fertilized objects. The second factor consisted of grapevine varieties. During the experiment, the size of yield, the phosphorus and potassium content, as well as the content of sugars and total acidity in the fruits were determined. The Recovery Efficiency, Agronomic Efficiency coefficients and Relative Agronomic Effectiveness were determined for the analysed doses and combinations of fertilizers. Regarding the volumes of the yield, the fertilization variant delivering 200 kg N, 87.2 kg P and 166 kg K ha-1 was found to be the most efficient. The research results showed that an increase in the dose of phosphorus by 100% without any parallel increase in the dose of potassium did not cause any significant growth in harvest yield. An increase in the doses of phosphorus and potassium had a significant effect on growth in yield, though also indicated a significantly lower use efficiency for the component applied. The applied fertilizer doses were not found to have caused any differentiation in the sugar content in grapes or in their acidity.  

25.4.2020