Activity of phosphomonoesterases in soil sown with maize
1998
Djordjevic, S.
The aim of the study was to determine the activity of phosphomonoesterases in different soil types, in different systems of maize fertilization, and to establish the effects of maize seed inoculation by different strains of phospho - mineralizing organisms. It has been found that humus - accumulative and cambic soils possess greater activity of phosphomonoesterases compared with hydromorphic and halomorphic soils, which depends upon the contents of humus, nitrogen, soil pH and texture. Kinetic and thermodynamic constants of phosphomonoesterase activity are different in different soil types. Very significant correlations were established between the activities of phosphomonoesterases and those of catalase, intertase, urease, protease and C and N biomass. The activity and the number of systematic and physiological groups of microorganisms in the soil sown with maize depend on the applied systems of fertilization, phenological stage of plant development, vinicity of the root system and study year. Bacterial strains from the genus Bacillus, Enterobacter, Proteus, Serratia, Flavobacterium, and Micrococcus caused increase in the length, mass and contents of N and P in the above-ground plant parts and plant root, as well as increase of microbiological activity in the soil in maize hybrids ZPSC-704 and NSSC-640. Higher effectiveness of inoculation was achieved in hybrid ZPSC-704.
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