EFFICIENCY OF EARTHWORM HUMUS - LUMBRIPOST ON SOIL BIOGENITY IN SUNFLOWER PRODUCTION (HELIANTHUS ANNUUS L.)

This research investigated efficiency of different amounts of earthworm humus lumbripost (1-8 t ha(-1)) and its combinations with NPK mineral fertilizers in sunflower production, in respect to dominant physiological groups of soil microorganisms (aminoheterotrophs and aminoautotrophs). Research was done on semigley loess type of soil in 12 fertilization variants. Application of this organic fertilizer in sunflower production had significant positive effect on aminoheterotrophic and aminoautotrophic soil microflora in amount of 8 t ha(-1) of pure lumbripost and in organic-mineral combination of 3 t ha(-1) of lumbripost + NPK mineral fertilization. These variants showed that application of pure lumbripost had positive effect on sunflower grain yield. Application of lumbripost (3-5 t ha(-1)) combined with NPK mineral fertilizer yielded over 4500 kg ha(-1) of sunflower grains.