RESIDUAL IMPACT OF TWO-COMPONENT MINERAL FERTILIZERS ON THE FERTILITY OF SOIL PREVIOUSLY CROPPED TO SUGAR BEETS
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The diversity in the quality of the two-component fertilizers manufactured by various Polish and foreign producers and present on the market, justifies research into their impact on plants and quality changes in the soil. The aim of the research was of analyze the impact of mineral two-component fertilizers produced by: Russian, Lithuanian and Polish manufacturers on changes in the content of macroelements, in soil after sugar beet cultivation. The effect of doses of the fertilizers used was also analyzed. The experiment was carried out in the years 2014–2017 in the Lipnik. The experimental plant was sugar beet variety Natura KWS. Two factors were compared in the studies: I factor – 3 two-component mineral fertilizers, Russian, Lithuanian and Polish POLIDAP®. II factor – 3 doses of two-component fertilization (minimal, optimal, maximum), which were 1.0, 2.0 and 3.0 dt per hectare respectively). Potassium fertilization was applied at rates of 1.25, 2.50 and 3.75 dt per hectare as potassium chloride. Fertilization with two-component fertilizers produced in Russia and Lithuania did not change the pH of the soil. The use of POLIDAP® caused a substantial soil acidification. After applying the Russian fertilizer, the soil’s phosphorus fertility remained at the medium level. The introduction of Lithuanian and Polish fertilizers into the soil changed the values of the content of phosphorus available in soil from low to high. Increasing the dose of fertilizers by 50% caused an increase in the content of phosphorus available in the soil, but it was not proportional to fertilizer rate. There were no discernible differences of the two-component fertilizers produced in Russia, Lithuania or Poland in terms of the content of removable magnesium in the soil.
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