Iesypenko V. Agrochemical argumentation of using fertilizers to cultivate potato planting material from mini-tubers

3. Research results showed that the use of Yara Mila fertilizers improved the soil nutrient regime and increased it's fertility by increasing the content of mineral nitrogen, available phosphorus and exchangeable potassium in arable layer. Improved soil nutrient regime in variants with Yara Mila fertilizers promoted better potato plant development, increased the assimilation surface of leaves, net productivity of photosynthesis and tubers formation. The addition of Mg15 stipulated improved use of soil nutrients (potassium and phosphorus), and contributed to increased productivity of photosynthesis and intensified the process potato tubers formation. It was found that the use of Yara Mila fertilizers (9-14-20), (10-20-20) and application of Mg15 stipulated increased output of seed potatoes fraction by 10-13% compared to the application of simple fertilizers. It was estimated the effectiveness of application different forms of fertilizer for growing seed potatoes in sod-middle-podzolic sandy loam soils. The application of simple fertilizer combined with Mg15 and fertilizers Yara Mila caused the highest respond on application of 1 kg of NPK with a harvest - 38-41 kg of potatoes. Following this, adding Mg15 provided the greatest energy efficiency - 3.9 and the highest value growth and profitability - 207%.