[Effect of mineral fertilizers on the microflora of corn roots].

The paper describes studies of the density of microorganisms grown on meat-peptone agar, fungi, nitrifiers, cellulose degraders, actinomycetes and azotobacter in the soil of the radical area of corn grown in field experiments with various doses and ratios of mineral fertilizers. In the forest-steppe zone (leached chernozem) of the Krasnoyarsk region mineral fertilizers activated proliferation of radical microorganisms grown on meat-peptone agar, fungi, nitrifiers and cellulose degraders. The effect of the tested fertilizers was dissimilar during plant vegetation. Under the influence of fertilizers proliferation of actinomycetes increased at the phase of 3--4 leaves. At later phases of the plant development a similar tendency was manifest upon soil application of N120P60K60, N60P120K60 and N120P120K120. The azotobacter density increased only after application of N60P120K60, N60P60K120 and N30P60K30.