Neilyk M. The biological particulars of ambrosia artemisifolia L. and chemical measures of its control in agrocoenosis of soy-beans on the right bank of Ukrainian forest - and - steppe regions

It was considered and researched the volume of spreading of Ambrosia artemisifolia L., its biological peculiarities and natural formation of groups of tall weeds in different agrophitocoenosis. Under the influence of spreading of the root excretion of ambrosia artemisifolia L. the similarity of winter wheat seeds, peas and barley decreased down to 75-85%. The productivity of ambrosia seeds was the largest (12859 seeds) when they've grown without the presence of cultivated plants around them. The considerable reduction of the soy-beans'productivity is defined even if 2-5 pieces/m2 of ambrosia plants are available, because they take out from the soil 356,9 kilos/h of useful matters. By reason of the mixed type of weeds, it was reached the considerable increase of herbicides activity. There were used the preparations from different gear of actions. Such mixes as : pivot( 0,5 1/h ) + phozilat forte ( 1,5 1/h), harmoni ( 6 1/h) + targa super ( 1,5 1/h) or phabian ( 0,07 kg/h) + targa super ( 1,5 l/h) reduced the general level of weeds to 83 -86 % and provided the safety of the harvest of soy - beans to 0,71 - 0,75 t/h. The usage of the chemical method for protection of soy - beans' plants from ambrosia artemisifolia L. and other weeds is economically effective and energetically expedient. The profitableness was in limits of 52-239%, and coefficient of energetic effectiveness is 2,5-12,8.