Published on 23 February 2019
The purpose of this work was to evaluate the opportunities for production of a liquid organic fertilizer from the waste left after processing of alfalfa herbage, and its influence upon preservation of fertility in the black soils of the Ciscaucasian region. Methods. To produce the fertilizer, we used the phytomass of Medicago sativa ('Manychskaya' variety) grown as forage grass and mown during the budding stage and blooming stage beginning. Herbage was wet-fractionated (including disintegration and fractioning of alfalfa vegetative mass) and dehydrated by means of mechanical compression producing press cake and green juice used further for green protein concentrates. Brown juice also generated in the process was a by-product, which used to be considered a waste. In our studies, brown juice was employed as a raw material for production of a fertilizer for the fields where alfalfa herbage had been harvested. During the study of brown juice applicability, we assumed the volume corresponding to the brown juice amount gathered from a unit of area within a season to be the reference fertilizer application volume. Results. It was established that brown juice from alfalfa herbage contains material quantities of nitrogen, ash constituents, phosphorus, calcium, potassium, and other compounds necessary for their replenishment in soil and adequate nutrition of the plants cultivated there. During chemical analysis of soil composition, priority was focused on active forms of humus, phosphorus, potassium, and nitrogen as the components most readily available for plant nutrition and thus also acting as productivity indicators. Performed analysis demonstrated that the levels of chemical elements increased following fertilizer distribution due to the return of substances extracted with the gathered herbage reaching practically the same level as in the initial soil samples collected in the vegetation period beginning (typical productivity levels of black soils in the Ciscaucasian region). Fertilizer application while alfalfa was still growing resulted in herbage yield increase observed throughout 3 hay cuttings in comparison with the control plot. The method designed for complex utilization of vegetable resources allows to produce besides animal feeding stuff a liquid organic fertilizer minimizing soil depletion and maintaining its productive capacity.
Categories: Articles, Geo-ecological,-Recreational-and-Biomedical-Issues-of-SDMT
Tags: почвенное плодородие, листостебельная масса растений, органические удобрения
ISSN 1998-4502 (Print) ISSN 2499-975Х (Online)