STUDY ON THE EFFECTS OF FERTILIZATION ON THE ABUNDANCE OF SOIL MICROBIAL COMMUNITY, ITS COMPOSITION AND ANTIFUNGAL EFFICACY

Abstract

Soil microbial community is of high importance in preserving soil functions and its ecosystem goods and services. Within field experiences, regarding agricultural sustainability and the resilience of agro-ecosystems, a study was conducted to evaluate the evolution and abundance of the soil microbial community under the influence of environmental and agro-technical factors. For this purpose, periodic determinations of the microbial community on the depth of 0-20 cm were made in the plots cultivated with wheat, maize, soybean and a mixture of perennial grasses and legumes. In the experimental field, organic fertilizer materials (manure compost in doses of 15, 30 and 60 t/ha) and synthetic fertilizers (complex fertilizer in formula 20.20.0, in doses which varied with the specific consumption of crops and the amount of manure compost) were applied. At the same time, in the laboratory, biometric determinations were made regarding the antifungal efficacy of soil microorganisms after 5 days from incubation. The results of microbiological analyses showed that the microbial population from soil inhibits the in vitro development of the pathogen tested.