EFFECT OF SPECIFIC ELEMENTS OF CULTIVATION TECHNOLOGY ON PHOTOSYNTHETIC ACTIVITY OF SUGAR BEET
In the article the results of researches of influence of specific elements of technology of cultivation of a sugar beet on photosynthetic activity of plants, namely application of a herbicide and microfertilizers are resulted. From literature sources and from own research, it has been established that herbicides have negative effect on sugar beet plants, especially on photosynthetic activity. An effective method of combating such stress was applying of microfertilizers as foliar nutrient, which is confirmed by the results of taking into account the area of the leaf surface, the determination of the clean productivity of photosynthesis (CPP), the photosynthetic potential (FP) and the fluorescence of leaf chlorophyll. Thus, during the interlocking phase in the hybrid ‘Impact’, a high leaf surface area was obtained against the background of the use of Alfa-Grou-Extra + Betanal Progress OF 1,4 l per ha flow was 4009 cm2, which is 17% higher than the value of the variant without any treatment (3416 cm2), and a low (3310 cm2) was in the version with the using of Betanal Progress of OF in the amount of 1,4 l per ha. Hybrid ‘Bulava’ has the highest CPP in the experiment against the use of microfertilizer Alfa-Grou-Extra and was 6,59g per m2 per day, exceeding the control by 4 %. The sensitivity of the induction of chlorophyll fluorescence to the chemical stress of sugar beet plants applied by a herbicide was also proved. When using the Betanal Progress OF in an amount of 1,4 l per ha, especially in the phase of interlocking the leaves in the rows, the initial fluorescence (F0) was observed at 3242 units. for the hybrid ‘Impact’ and within 2245 units for 'Bulava', which indicates the inefficient use of solar energy by the leaves of sugar beet plants. Microfertilizers managed to remove this stress and reduce the F0 to a level of about 180 units. for the ‘Impact’ in the variant with Alfa-Grou-Extra + Betanal Progress OF in amount of 1,4 l per ha and about 114 units. for the hybrid "Bulava" in the version of Micro-Mineralis + Betanal Progress OF in amount of 1,4 l per ha.