The goal is to develop the main elements of biologization of the No-till system in the conditions of the Piedmont-steppe zone of Crimea, to study the effect of various types of ground cover crops on soil fertility, yield and grain quality of agricultural crops in conditions of insufficient and unstable moisture. When intermediate crops were cultivated as ground cover crops in the No-till system, the available moisture reserves in the meter layer were at a satisfactory level after vetch cultivation - 107.6 mm and in the control (without ground cover crops) - 99.6 mm. The highest yield of green mass of ground cover crops was in all variants with the use of multicomponent mixtures, which was 2 or more times higher than the yield of intermediate ground cover crops from 1–2 and 3 spring crops and almost 10 times higher than that of winter rye. This made it possible to fix 30–33 kg of nitrogen, 4–5.9 kg of phosphorus and 13.9–16.7 kg of potassium in plants and in the root system annually by the end of the growing season of spring crops per hectare of sowing.

The aim is to create the fundamental biologization’s components of no-till system in the environment of foothill-steppe Crimea’s area, to explore the effect of different kinds of cover crops on the indications of soil fertility, on the crop productivity and on the seeds’ quality of the agricultural crops in terms of poor and unstable humidification. During the cultivation of the cover crops in no-till system the reserves of available humidity in the thickness of one metre were acceptable after the growing of vicia – 107,6 millimeters and on the control (without the cover crops) – 99,6 millimeters. The least reserves of available for the plants humidity were in the option with winter rape, as in pure form (59,3 millimeters), as in combination with vicia (44,9 millimeters). The highest crop productivity of cover crops’ green mass was in all cases with the using of the multicomponent combination. It exceeds the crop productivity of the cover crops consisting of 1-2 and 3 sping crops more than twice as much and almost more than 10 times – the crop productivity of the winter rye.

The analysis of the main historical stages of the development of the theory of minimization of tillage, as well as data obtained during long-term stationary studies, is made. Over the long-term period, the use of non-dump resource-saving tillage in crop rotation was not inferior in efficiency, and in some indicators even exceeded the combined multi-depth tillage (including dump loosening of the soil). The data on the positive effect of the combination of the no-till system and the cultivation of groundcover crops in the crop rotation on the soil fertility with signs of its extended reproduction are presented.