Assessment of the quality of food potato varieties depending on the fertilizers used

The purpose of research is to study the effect of biofertilizers on the quality indicators of potato tubers of various varieties in the conditions of the Ryazan Region. The studies were conducted in 2020-2022 in the conditions of the Scientific Research Center "Agrotechnopark" of the Ryazan District of the Ryazan Region on gray forest heavy loamy soils. The objects selected were five early-ripening varieties of table potatoes (Red Lady, Labella, Queen Anna, Lilly, Red Scarlett) and six options for the use of biofertilizers ("Rau Activ", "Azotovit", "Phosphatovit", "Ecorost"). The field experiment was carried out in quadruple repetition. Agrotechnical activities in the studies were carried out in accordance with zonal recommendations. All observations, records and analyzes were carried out using standard methods. Fertilizers had an increasing effect on all elements of the yield structure of potato varieties. The varieties Red Lady and Red Scarlett, against the background of the use of "Azotovit" together with "Rau Activ", gave a large increase in tuber weight (+118.84 and +119.57 g/bush, respectively). The varieties Red Lady and Red Scarlett, against the background of the use of "Azotovit" together with "Rau Activ", gave a large increase in marketability (+9.8 and +9.4 % compared to the control, respectively). In the variant with the use of "Azotovit" + "Rau Aktiv", the excess of the control yield was 34.24 c/ha, or 24.2 %. According to the experimental variants, the starch content in potato tubers was most influenced by the use of "Ecorost". The varieties Red Scarlett (+5.2 %) and Red Lady (+4.8 %) were more responsive. Red Lady and Queen Anne, when using "Ecorost", switched from culinary A (waxy) or salad type to mixed type AB. Pre-planting treatment of tubers with "Rau Activ" together with vegetation treatment with "Azotovit" had an impact on improving the culinary qualities of the Red Lady, Queen Anna and Red Scarlett varieties.