FIELD: agriculture.
SUBSTANCE: invention relates to auxiliary substances for improving the biological efficiency of an agrochemical. The use of a compound of the formula (I) as auxiliary substance for improving the biological efficiency of an agrochemical is proposed: 
where R is an alkyl or alkenyl group with a straight or branched C16-C18 chain, PO is a propylene oxide link, EO is an ethylene oxide link, m is from 4 to 9, and n is from 4 to 25.
EFFECT: invention allows implementing the specified purpose.
1 cl, 12 tbl, 11 ex
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