The aim of the work was to determine the influence of green manure and intermediate crops on productivity and quality of vegetable crops in the chain of irrigated crop rotation. The technologies recommended by zonal agricultural systems when cultivating agricultural crops were used. Chains of crop rotations, productivity, product quality and soil fertility were studied according to the methods of V.F. Moiseychenko and others. The soil moisture content was maintained at least 80 % HB in the 0.4 m layer. A variety of sugar corn Morning song, durra – Hazine 28, saperda mustard – Don 8, potato – Zhukovsky early, bulb onion – Amber 29 were sown. The largest number of grain units (37.4 t per ha) was obtained in a variation of the experiment where sugar corn, mustard as a green manure for summer-planted potatoes and onion sown by seeds into ground were planted in the crop rotation chain. When applying green manure for a previous crop, the onion damage was the least. When using intermediate crops, the disease damage increased by 7.7–15.4 %. At semi-fallow soil tillage for the previous crop, this index was the largest (16–17 %, which is 23.1 and 30.8 % higher than in the control version). Green manuring and sowing of intermediate crops had a direct effect on summer-planted potato tubers quality. In the variants of the experiment in which green manure was cultivated before potatoes planting, the highest yield (43.5 t per ha), more dry matter (10.9 t per ha) and starch (5.6 t per ha) were obtained. The green manure and intermediate crops usage influenced favorably both the productivity of following crops and the quality and commercial properties of potatoes and onions.
Key words: green manure crops, intermediate crops, summer planted potatoes, bulb onion, productivity, irrigated crop rotation.
