The objective of the research was to study the patterns of yield formation for summer planting potato and its quality depending on green manure crop growing at irrigated ordinary chernozems. Green manure crops were pea, lupine, buckwheat, spring rape, and brown mustard (Brassica juncea). The duration of vegetative period at all variants was from 101 to 112 days. The relationship between the productivity of summer planting potato and green manure crop was established. During harvesting at the plots occupied by mustard potato yield was 43.5 t/ha, by pea – 42.6 t/ha, by lupine – 41.8 t/ha, by rape – 39.8 t/ha, buckwheat – 38.3 t/ha, at the control variant without green manure crops – 35.3 t/ha. Using mustard as a green manure crop enables to get the highest potato productivity. Potato yield increased by 27 % compared to control variant. The greatest mass of a single potato tuber (96.8 g) was obtained at the plot where mustard was planting. High indices were got at the variants with legumes (pea – 89.3 g, lupine – 85.6 g) and buckwheat (83.2 g). The lowest yield was after spring rape – 71.4 g. At the variants where mustard used, dry matter in potato tubers was 10.6 t/ha, starch content – 12.6% which exceeded the control variant by 14.6 and 14.5 % respectively. The lowest quantity of tubers affected by diseases was marked at the variant with mustard 11 % against 18 % at the control variant without green manure crop.
