The influence of NPK fertilizers on the development of oligonitrophyls in alluvial soils
2008
Pesakovic, M., Fruit Research Inst. Cacak (Serbia) | Dukic, D., University of Kragujevac, Cacak (Serbia). Faculty of Agronomy Cacak | Mandic, L., University of Kragujevac, Cacak (Serbia). Faculty of Agronomy Cacak | Miletic, R., Fruit Research Inst. Cacak (Serbia) | Rakicevic, M., Fruit Research Inst. Cacak (Serbia)
Over 2003 – 2005, a study was performed on the influence of different rates of NPK fertilizer on oligonitrophyls pressure in alluvial soil of a plum orchard. The trial was set up in the experimental plum orchard established by Fruit Research Institute Čačak, as well as at the laboratory of Department of Microbiology, Faculty of Agronomy Čačak. The soil was treated with 400 – 1,000 kg haE-1 of 8:16:24 + 3 % of MgO mineral fertilizer. Unfertilized soil served as the control. The effect of the studied mineral fertilizer was determined three times over the growing season, oligonitrophyls pressure being checked by indirect rarefaction method on Fyodorov's nutritive me dium. The application of high fertilizer rates brought about decrease in oligonitrophyls pressure. Of all studied variants, the one with highest nitrogen rate (variant N4) exhibited the strongest inhibitory effect. On the other hand, fertilizer rates enhanced the number of oligonitrophyls. The influence of the fertilizer was highest at the third sampling. Furthermore, the effect was highest in 2003. The application of 600 kg haeE-1 of mineral fertilizer gave highest plum yield.
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