Abstract
Investigations on light gray forest soils of the Chuvash Republic were carried out to study the effectiveness of the use of horn-ungulated meal or keratin as a nitrogenous organic fertilizer and zeolite-containing trefoil as a sorbent-type soil improver. The use of horn-ungulted meal as a nitrogen fertilizer of organic origin helps to enhance the biological activity of the soil. Observations during the vegetation period revealed a more intense coloration of the leaf surface, as well as an increase in the area of the assimilative surface of fodder beet and potatoes. The results of the determination of quality indicators has revealed the possibility of obtaining environmentally friendly products, as there has been a decrease in the content of nitrates in root crops fodder beet and potato tubers, increased dry matter content and sugar content in root crops fodder beet and in the tubers of potato dry matter and starch.The conducted studies have revealed the possibility of replacing the mineral form of nitrogen fertilizer with a nitrogen fertilizer of organic origin - horn-ungulated meal (keratin), which is a waste of the livestock industry. The joint application of zeolite-containing fossil meal together with horn-ungulated meal and phosphoric-potassium mineral fertilizers positively affected the increase in the use of nutrients from them not only in the row crops in the year of application, but also in the subsequent barley culture, increasing its yield and economic efficiency.
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