In the pot experiments, the effect of crotonic acid on the efficacy of herbicides Kukugran 340 SE (bromoxynil 90 g/l + terbuthylazine 250 g/l) and Nikosar 060 OD (nicosulfuron 60 g/l) applied at doses reduced by 50, 80 and 90% was investigated. Control groups with single application of the investigated products were also included. Crotonic acid affected the efectiveness of herbicides differently, depending on the herbicide, its dose and weed species. Its effect on weed control was only observed for the lowest doses (reduced by 80 and 90%). The addition of crotonic acid to spray solutions did not affect the effectiveness of the tested herbicides against Capsella bursa-pastoris. It improved the efficacy of the tested herbicides against Chenopodium album when reduced doses were used and the efficacy of Kukugran 340 SE against Matricaria inodora when the dose lowered by 90% was applied. Antagonism between crotonic acid and Nikosar 060 OD was detected when used against Viola arvensis, M. inodora and Amaranthus retroflexus. The tested doses of crotonic acid used in the mixtures showed similar efficacy.

W doświadczeniach szklarniowych badano wpływ kwasu krotonowego na skuteczność herbicydów Kukugran 340 SE (bromoksynil 90 g/l + terbutylazyna 250 g/l) i Nikosar 060 OD (nikosulfuron 60 g/l) w dawkach obniżonych o 50, 80 i 90%. Uwzględniono również obiekty z samodzielną aplikacją każdego ze środków. Kwas krotonowy w zróżnicowany sposób wpływał na efektywność herbicydów, w zależności od rodzaju środka, wysokości jego dawki oraz gatunku chwastu. Jego wpływ na herbicydy zaobserwowano tylko dla dawek najniższych, tj. obniżonych o 80 i 90%. Dodatek kwasu krotonowego do cieczy opryskowych nie wpłynął na działanie badanych herbicydów w stosunku do Capsella bursa-pastoris, natomiast poprawił działanie badanych środków w dawkach najniższych w odniesieniu do Chenopodium album oraz środka Kukugran 340 SE w dawce obniżonej o 90% w stosunku do Matricaria inodora. Działanie antagonistyczne mieszaniny kwasu krotonowego z herbicydem Nikosar 060 OD stwierdzono w przypadku Viola arvensis, M. inodora i Amaranthus retroflexus. Badane dawki kwasu krotonowego użytego w mieszaninach działały z podobnym skutkiem.

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