Forage quality and energy content of perennial legume-grass mixtures at three level of N fertilization

Abstract

The aim of this study was to investigate fodder quality and nutritive value of different grass-legumes mixtures influenced by various level of N fertilization. Studied factors had an impact only on the content of crude protein (CP), crude protein yield (CPY) and nitrate content in the forage. The level of N fertilizer showed a highly significant and positive impact on the CP and nitrate content. Treatment with 210 kg N ha-1 is characterized by the highest content of CP and nitrate of 189.7 g kg-1 DM and 2524 ppm, respectively, and the highest protein yield of 1.95 t ha-1. The value of nitrate in the forage does not exceed the limit that is considered hazardous to the health of animals. Energy value of forage obtained from the grasslands of ME ≈ 7.75 and NEL≈ 4.32 MJ kg-1 DM is lower than values obtained in other studies.

Cilj ovog istraživanja je bio da se ispita kvalitet stočne hrane i hranljiva vrednost različitih travno-leguminoznih smeša pod uticajem različitih nivoa N đubrenja. Ispitivani faktori imali su utisaja samo na sadržaj sirovih proteina (CP), prinos proteina (CPY) i sadržaj nitrata u krmi. Nivo N đubriva ispoljio je visoko značajan i pozitivan uticaj na promunu sadržaja CP i nitrata. Tretman sa 210 kgN ha-1 karakteriše se najvećim sadržajem CP i nitrata od 189,7 g kg-1 DM odnosno 2524 ppm kao i najvećim prinosom proteina od 1,95 t ha-1. Vrednost nitrata u krmi ne prelazi limit koji se smatra opasnim za zdravstveno stanje zivotinja. Energetska vrednost krme dobijene sa travnjaka je niži u odnosu na druga istraživanja i iznosi za ME ≈ 7,75 i NEL ≈ 4,32 MJ kg-1 DM.