Quality and quantity transformations of nitrogen substances in maize silage with added urea and organozeolite

Abstract

In this experiment the influence of urea and organozeolite addition on quality and quantity of nitrogen fractions, chemical composition and quality of maize plant silages was investigated. The experiment was organized as a two factorial, where first factor (A) was addition of urea (a1=0; a2=5 g/kg; a3=10 g/kg green mass) and second factor (B) was addition of organozeolite (b1=0; b2=2 g/kg green mass). Results of chemical analyses showed that with the addition of urea there was a significant increase in the amount of crude, ammonia and soluble nitrogen, and decrease in the amount of true protein nitrogen. Under the influence of urea and organozeolite there were significant variations in absolute values for lactic, acetic and butyric acid. At the same time the relative ratio of organic acids was similar, and therefore all silages were ranked as I quality class according to Flieg scoring system.

U eksperimentu je ispitivan uticaj dodavanja uree i organozeolita na hemijski sastav i kvalitet silaža spremljenih od cele biljke kukuruza. Ogled je postavljen kao dvofaktorijalni, gde je prvi faktor (A) bio količina dodate uree (a1=0; a2=5; a3=10 g/kg zelene mase), a drugi faktor (B) količina dodatog organozeolita (b1=0; b2=2 g/kg zelene mase). Dodatak uree uticao je značajno na povećanja količine ukupnog, amonijačnog i rastvorljivog azota i smanjenje količine proteinskog azota. Upotrebom organozeolita smanjena je produkcija amonijaka i rastvorljivost azotnih materija. Pod uticajem uree i organozeolita došlo je do značajnog variranja apsolutnih vrednosti za mlečnu, sirćetnu i buternu kiselinu. Nasuprot tome, njihov relativni odnos se nije bitnije menjao, pa su sve silaže ocenjene I klasom po Flieg-u.