The activity of nitrogen fixators with barley
2003
Stokuca, S.
The research on the number of diazotrophs and other groups of microorganisms in the rhizospheric and surrounding soil were conducted. They involved three sorts of the barley (Viktor, Milan and Jelen) that have been grown in the field conditions, in the soil of the black, carbon type. Four types of Azotobacter chroococcum, two types of Azospirillum lipoferum, two types of Beijerinckia derx and two types of Klebsilella planticola have been chosen for the examinations of the diazotrophs effectiveness in the controlled (greenhouse) conditions. The number of certain systematic and physiological groups of micro-organisms and dehydrogenase activity in the barley cropped soil depended on the sort of the barley, specimen taking place, specimen taking period as well as the year of the researches. The studies have established that the microbiological activity was mostly greater in the rhizospheric soil and in the end of vegetation with all three sort of the barley. The efficiency of the diazotrophs depended on the kind and type of the diazotroph, sort of the barley as well as on the characteristic examined with the plants grown in the controlled conditions. In average, the most efficient kind and type, with Viktor, was Klebsiella planticola (type 4), with Milan it was Beijerinckia derx (type 1), while it was Azotobacter chroococcum (type 2) with Jelen. Almost all examined kinds and types of diazotrophs have caused the increase in the number of all examined systematic and physiological groups of microorganisms and dehydrogenase activity, as well as the increase in the nitrogen content in plants and soil.
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