The effect of a sawdust alkaline extract introduced to activated sludge on the biological activity of its liquid fraction in soil irrigation

The studies show that a liquid fraction of activated sludge produced from a mixture of activated sludge with a sawdust alkaline extract can be used in soil irrigation as a plant growth stimulator without dilution. Germination energy increased by 6%, germination capacity - by 11%, number of seeds with high germination power - by 11%, biological activity of the fraction - by 19.3%. A liquid fraction produced from the mixture of activated sludge + 0.5% sawdust alkaline extract was found to be the most effective one for irrigation. 5 liters per tonne (1 m3) were found to be sufficient to increase the biological activity of the activated sludge liquor.