| Summary: | Results of researches on efficiency of use of liquid organomineral fertilizers at the background of different fertilizer systems are provided. Researches were done on light gray forest soil in a 5-field short- crop rotation. Results of three-year stationary researches of medicines Mochevin K No. 1, Mochevin K No. 2, Organik D2M and the Humate of potassium influence on productivity and quality indicators of a potato harvest are analyzed. Thus, the highest productivity on options without introduction of liquid complex fertilizers was received in agro technologies which were based on an organomineral system, – 31.9 t/hectare. At the same time, the gain of relatively biological control made 7.8 t/hectare or 32.2%. Processing by liquid complex medicines increased efficiency of technology of cultivation, having provided additional increase in productivity by 3.5–8.0 t/hectare or 11.0–27.3%. Thus, Mochevin K No. 1 was the least effective – the gain depending on a fertilizer system made 3.5–5.1 t/hectare or 11.0–17.5%. The humate of potassium promoted yield increase on 5.0–6.8 t/hectare or 15.8–23.1%, Organik D2M – on 5.4–8.0 t/hectare or 17.5–27.3%, and Mochevin K No. 2 – on 6.3–8.0 t/hectare or 20.2–27.3%. In general, the organomineral system with use of complex liquid fertilizers of Mochevin K№2 and Organik D2M provided the largest productivity of culture in experience (38.0–38.5 t/hectare) and also increasing in plasticity of a grade, reduced variation of productivity after years. It is established that a determinant factor rendered use of liquid organomineral fertilizers on improvement of quality indicators of a potatoharvest (content of ascorbic acid and starch). This way, processing of potato landings the medicines Organik D2M and the Humate of potassium at the background of an organomineral fertilizer system provided the high content of ascorbic acid in tubers. Organik D2M promoted obtaining the largest content of starch after all fertilizer systems – 15.0–15.2%. Further researches will be directed to studying of efficiency of complex liquid use of fertilizers in the system of organic production at the increased income levels to the soil of alternative and traditional types of organic fertilizers (straw, green manure crops, manure, vermikompost)
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