Effect of Mikotop biological product and NaturAgro EcoGrow soil builder as straw decomposers on C-CO2 emission and decomposition degree in a laboratory experiment

Abstract

The most complete information about the nature of the action of biological products on the processes of straw decomposition (mineralization) and humification is shown by laboratory experiments conducted under optimal moisture and temperature conditions. The introduction of straw in doses of 4 and 6 t ha under laboratory conditions with composting of leached low-humus medium-loamy chernozem in its pure form and using the Mikotop biological product at a dose of 1 L ha and NaturAgro EcoGrow soil builder with active silicon in 70 days increased C-CO₂ losses from 19.12 mg per 100 g of soil to 46.96 and 61.08 mg per 100 g of soil when applying straw only. When straw was inoculated with the Mikotop biological product, the emission increased to 52.74 and 63.28 in accordance with the straw dose; and when straw was treated with NaturAgro EcoGrow, there was a noticeable decrease in total C-CO₂ losses to 38.6 and 51.35 mg per 100 g of soil. The biological product Mikotop does not enhance straw decomposition compared to the variants when straw only is applied, while NaturAgro EcoGrow reduces it. The percentage of carbon mineralization of straw at a dose of straw of 4 tons is 15.43, and at a dose of 6 tons - 13.41%. At the same time, Mikotop at a dose of 4 tons increased mineralization to 17.3%, and at a dose of 6 tons it was at the level of applying straw only. NaturAgro EcoGrow soil builder reduced mineralization at both doses: to 12.7 and 11.27%, respectively. The introduction of straw in its pure form and treated with the product under discussion by the end of composting contributed to increasing level of N-NO₃, especially when applying 6 t ha of straw.