Studies on the grassland management in late-autumn and early-spring, 6; Effect of fertilizer application time in early spring on growth, yield and nutritive value of grasses for hay

abonado de cobertera apport en couverture conduite des herbages crecimiento croissance fertilisation fertilizer application foin gramineas graminee grasses grassland management growth hay heno manejo de praderas primavera printemps rendement rendimiento spring yields