Brown coal (leonardite), Kirovohrad oblast.

Leonardite is applied to the soil for cultivation at the consumption rate of 0.3 - 0.4 t/ha, while it contributes to
improvement of soil structure; acceleration of growth and development of agricultural plants and flower crops; prevention of surface erosion; to increase the moisture retention rate; normalization of soil acidity; enrichment of the soil with organic and mineral substances (nutrient elements N, P, K, Zn, Fe, etc. are found in compounds available to plants); reducing the amount of toxic substances in the soil; elimination of chlorosis in cultural plants caused by iron deficiency, etc.