Effect of the sowing method, sowing date and row spacing on the yield and fodder value of autumn regrowth and straw of perennial ryegrass (Lolium perenne L.) on the seed plantation

analytical methods automne autumn contenido de materia seca contenido proteico crude fibre date de semis dry matter content espacement espaciamiento fecha de siembra fibra bruta fibre brute field experimentation lolium perenne nutrientes nutrients nutritive value paille paja plantaciones plantations poland pologne polonia protein content rebrote regrowth rendement rendimiento repousse seed semence semillas sowing date spacing statistical methods straw substance nutritive technique analytique valeur nutritive valor nutritivo variedades varieties yields