Whole crop maize was harvested in wax to glaze stage of corns’ maturity and ensilaged in microsiloses without additive (control group) and with additive of chemical preservative (mixture of formic, lactic, propionic acids and ammonium propionate) in three dosages: 0.6-0.4-0.2%. In green forage of maize (before conservation) as well as in silages concentration of basic nutrients and minerals was determined and on this basis nutrients losses were calculated. The quality of silages (pH, ammonia concentration in total nitrogen level, share of lactic, butyric and acetic acid in sum of all acids acc. to Flieg-Zimmer scale) was evaluated, also. During maize conservation under laboratory conditions the dry matter losses without additive were 6% and in silage with preservative in dose 0.6 only 1%. In this group the nutrients and minerals losses were lowest, as well as the share of lactic acid increased from 17 (control group) to 63% and ammonium concentration decreased from 8 to 5% N total. The lower dosages of preservative (particular 0.2%) were not so effective.

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