The paper presents the results of plot experiments on susceptibility of 4 cultivars of fiber flax: Alba, Belinka, Nike and Wiko to broad-leaved weed herbicides (chlorsulfuron, bentazon + MCPA) and graminicides (haloksylop-R, chizalofop P, and setoxidim), used as single or mixtures. The experiments were conducted on two soil suitability complexes in the years 1994-1996. The cultivars Alba and Wiko were more susceptible to herbicides than Nike and Belinka. More susceptible Alba and Wiko showed faster phenological development as compared to two other cultivars, especially in the first period of growing season (from germination to the stage of fast growth). Herbicides had more phytotoxic effect on flax plants on light soil than on other ones. The most phytotoxic effect on tested cultivars, leading to a reduction of scutched fiber yield, was observed for the mixture of haloksylop-R + chlorsulfuron and bentazon + MCPA followed by setoxidim at 7-day interval. Higher yields of most flax cultivars were observed when flax was sprayed with chlorsulfuron herbicides followed by one of the tested graminicides (haloksylop-R, chizalofop P or setoxidim) after seven days from application of chlorsulfuron. The cultivar Nike has been found to be the most resistant to tested herbicides. Application of chemical methods of weed control for cultivation of this cultivar resulted in an increase of long yield of scutched fiber. The herbicides tested in the experiment usually had a beneficial effect on the quality of flax scutched fiber, especially in case of Alba and Wiko cultivars.
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