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PIGMENTS CONTENT IN LEAVES OF GRAIN SORGHUM UNDER THE INFLUENCE OF THE HERBICIDE CYTADEL 25 OD, PLANT GROWTH REGULATOR ENDOFIT L1 AND BIOPREPARATION BIOARSENAL

Content of the chlorophylls and carotenoids in a pigment complex is one of the most important factors that determine the productivity of crops of cereals. Although it is well known that herbicides and plant growth regulators may cause changes in the amount of pigments, there is lack of researches about their separate and integrated influence on the pigment complex of grain sorghum (Sorghum bicolor (L.) Moench). Therefore, we aimed our research to investigate the response of grain sorghum’s pigment complex to the impact of the herbicide in different combinations with the plant growth regulator and biopreparation. In result, it was found that the content of the pigments was decreasing simultaneously with increasement of the herbicide rate. However, the obtained data indicates that the complex usage of the herbicide and plant growth regulator had an auspicious influence on the pigments content, compared to the variants where only herbicide was applied. The similar auspicious effect appeared, when the herbicide was applied on the background of pre-sowing seeds treatment by the biopreparation Bioarsenal. It is noticeable that in this case the increasement of pigments content was higher than in the variants of compatible application of the herbicide and plant growth regulator. The highest indicators of the pigments content formed when the herbicide was applied compatible with the plant growth regulator on the background of pre-sowing seeds treatment. The content excess of the chlorophylls a, b, a+b and carotenoids, relatively to the control, amounted 7,4 – 9,1%, 16,0 – 18,3%, 9,4 – 11,2% and 35,5 – 40,2% respectively. It is evident that usage of the herbicide Citadel 25 OD compatibly with the plant growth regulator Endofit L1 on the background of pre-sowing seeds treatment by the biopreparation Bioarsenal is an effective measure, which allows to reduce the harmful impact of the xenobiotic on the pigment complex of grain sorghum