The influence of pesticides on nitrogen fixers growth and activity
1989
Todorovic, M. | Trifkovic, V. (Poljoprivredni fakultet, Beograd (Yugoslavia). Katedra za mikrobiologiju)
It was investigated the influence of chemical means-pesticides mostly used in plant production on growth of some symbiotic (Rhizobium) and non-symbiotic (Azotobacterium) nitrogen fixers. The used chemical means-pesticides were: fungicides (cineb, benomil, bayleton) insecticides (gusation, lindan, sumicidin) and herbicides (afalon, prometrin, treflan). From symbiotic nitrogen fixers were used: Rhizobium melioloti, Rhizobium leguminosarum and Rhizobium phaseoli and from non--symbiotic nitrogen fixers Azotobacterium chroococcum ZP-1, Azotobacterium chroococcum OS-5 and Azotobacterium sp.PR-19. Beside the pesticides influence on the development of symbiotic and non-symbiotic nitrogen fixers it was also examined the nitrogenase activity, by non--symbiotic nitrogen fixers. The investigated pesticides had expressed different influence on symbiotic and non-symbiotic, nitrogen fixers. The inhibitory influence of pesticides is more expressed on the development of symbiotic nitrogen fixers. The most sensitive on the pesticides influence were Rhizobium leguminosarum and Azotobacterium chroococcum ZP-1. From pesticides cineb and afalon had most influenced on the decrease of nitrogen fixer development and on the decrease of nitrogenase activity by non-symbiotic nitrogen fixers.
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