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The problem of conservation and reproduction of soil fertility by using unconventional organic fertilizers, particularly the replacement of the mineral nitrogen fertilizer to its organic form is discussed. The growth of the livestock industry lays the groundwork for the recovery of meat processing industry waste of horned ungulate crumbs (HAC) as fertilizer for inter-tilled crops. HAC contains about 14% nitrogen. Experiments on the application of HAC as a nitrogen fertilizer and sorption-type ameliorant – zeolite-containing tripoli were organized in 2012-2016 in the crop rotation link on the light gray forest soil of the experimental field of the FSBEI HE Chuvash State Agricultural Academy, Chuvash Republic. In this paper, the effect of the HAC-form on the optimization of nitrogen nutrition of the studied crops both separately and for tripoli having phosphorus-potassium mineral fertilizers is studied. The positive effect of HAC and tripoli on the growth and development of potato and fodder beet plants, soil biological activity, leaf surface area, yield and quality indicators of potato tubers and fodder beet root crops both in the first year when fertilizers are applied and in their aftereffect in the second year for barley yield was revealed. The study materials contribute to the practical solution of the problem of the recovery of meat processing industry waste and rational use of resources in the fertilizer system, being a guide to energy and resource conservation in agriculture.

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The obtained results indicate the influence of the feeding area of potato micro-plants on the number of mini-tubers of promising varieties. In the experiments, micro-plants were placed in pots as follows: one plant in a pot with a nutritional area of 380 cm2, two plants in a pot - 190 cm2, three plants - 127 cm2, plants - 95 cm2. It was noted that with a decrease in the area of plant nutrition, the height of plants increased, as well as the number of tubers obtained from one plant. The study of the fractional composition of tubers showed that in order to obtain the maximum number of mini-tubers of potatoes, the most valuable fraction for further planting is not recommended to place one plant in a pot. Varieties reacted differently to the density of micro-plantings. For example, Gulliver and meteor varieties have an optimal feeding area for one plant to form tubers of the optimal fraction of 190 cm2, Zumba and Samba – 127 cm2, Reggae and Courtney – 95 cm2. In the salsa variety, there were no differences in this trait between variants with a feeding area of 95 to 190 cm2.

For the first time in the conditions of the Volga-Vyatka region of the Russian Federation, we determined the parameters of planting micro-plants for the output of potato mini-tubers. The study has shown that to increase the yield of mini-tubers of potatoes, it is necessary to develop an optimal method for planting micro-plants that is most suitable for each variety. Some potato varieties, such as Reggae and Samba, produce more mini-tubers when the planting density increases. Whereas Bellarosa potato plants will produce more mini-tubers if the nutrition area for each plant is increased by reducing planting density. In potato varieties Reggie and Samba, by increasing the density of planting, the yield of mini-tubers increases. For the Bellarosa variety, a decrease in the planting density of micro-plants is required.