CHANGES IN BACTERIAL COMPLEX SOILS UNDER THE INFLUENCE INTENSIVE CULTIVATION OF ONION BULB IN ANNUAL CROPS
Studied the rhizosphere bacterial flora under 5 hybrids and 1 variety of onion cultivated according to intensive technology in the annual culture on leached Priobia. It is shown that intensive cultivation of onions on a background of drip irrigation is an important regulatory factor for environmental bacteria of the rhizosphere. It increases the saturation of the soil microorganisms oligonitrophilous 1,5 times or more and tightens border abundance of ammonification under 70% of the studied bows. In addition, pesticide stress changes the dominant environmental strategy of bacterial community. Among numerous ammonification become more numerous K-strategists with narrowed population density fluctuations, whereas with limited pesticide load in the rhizosphere by dominated r-strategists with a wide variability of abundance. Amylolytic bacteria characteristic inverse relationship. These changes indicate a decrease in the rhizosphere bows after pesticide application of organic nitrogen. In the group of middle-bows and early Solushn F1 hybrids showed a sustained negative impact of pesticide loads on mineralization activity of the soil.