Uman NUH | today: 05/22/2019

Yield of a pear plantation depending on changes in soil fertility with the optimized fertilizer

Author(s) Yakovenko R.V., Candidate of Agricultural Science, , Uman National University of Horticulture, Ukraine
Kopytko P.G., Doctor of Agricultural Sciences, Professor, Uman National University of Horticulture, Ukraine
Petryshyna I.P., Postgraduate, , Uman National University of Horticulture, Ukraine
Category The Agronomy
year 2018 issue Випуск №92. Частина 1
pages 247-256 index UDK 631.559:634.13:631.45:631.8-048.34
DOI
Abstract The results of studies of changes in soil fertility and productivity of Konferentsia and Osnovianskaya pear varieties on quince A clonal rootstock grown again after the old pear garden on the dark gray podzolized soil in Right-Bank Forest-Steppe, depending on the optimized fertilizer are shown. By introducing norms of nitrogen and potassium fertilizers calculated from the results of agrochemical analyzes of the soil, optimum levels of compounds and forms of N-NO3 and K2O available to plants in the root layer were created (phosphorus fertilizer was not applied when the P2O5 was over-optimized in the soil). The biological activity of the soil and the reaction of the soil solution towards the acidification changed insignificantly, from pH 6.5 to 6.3. Created by the application of calculated nitrogen and potassium fertilizer norms, optimal levels of N-NO3 and K2O (recommended for apple) in the soil with additional application of N30K30 ensured the greatest increase in the yield of Konferentsia and Osnovianskaya pear varieties by 45.1 and 31.4%, respectively, in comparison with unfertilized trees and by 11.8 and 3.5% with production check variant after the annual application of N90P60K90. Application of calculated fertilizers that contain only those nutrients that are not sufficient in the soil for optimum nutrition of fruit trees is more economical, as well as more expedient by the effect on the ecological state of the soil and environment than the annual introduction of significantly larger fixed rates of all fertilizers. On the whole, the results of studies show that the content of nitrate nitrogen determined by the nitrification capacity of the soil and exchange forms of potassium for a pear should be slightly higher than for an apple on dark gray podzolized soil (N-NO3 25-28 mg/ kg and K2O 260-290 mg/ kg).
Key words pear, yield, Konferentsia, Osnovianskaya, fertility, fertilizer, optimal level.
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