Abstract:
Researches were carried out on south region of Moldavian plain,
studying the effects of fertilization and different ratio of perennial fodder
plants (grasses and legumes) from vegetal canopy of two temporary meadows
on soils microflora. Perennial fodder legumes were represented by Medicago
sativa and Lotus corniculatus, and the perennial fodder grasses by Dactylis
glomerata, Festuca pratensis, Poa pratensis and Lolium perenne. The
temporary meadows have been fertilized with an unconventional product
(Vinasse), and with different doses of organic (dung) and chemical fertilizers
(N, P). The by-product Vinassa Rompak (3% N, 0.5% P, 7% K, pH 7-8),
resulted from the yeast obtaining technology process, can be a good fertilizer
and a factor for maintaining the balance between the soils microorganisms
populations.
The objectives of this investigation were to isolate and quantify the
existing microbial population in soil (Gram positive bacteria, Gram negative
bacteria, micromycetes and the nitrogen-fixing bacteria) establishing their
participation ratio, the main fungus genres which activate in soil and their
activity level for each variant.
The results illustrate the influence of the fertilization on the total
number of microorganisms, on the relationship between the main groups
(bacteria and fungi), and on the micromycetes spectrum determined in each
variant of our experiment.
