The impact of differences in nitrogen content, nitrogen utilization and loss from laminae on competition between four grass species in an old pasture

abonos abonos nitrogenados agrostis stolonifera avejentamiento azote biological competition chemical composition composition chimique crecimiento croissance efficiency eficacia engrais fertilizers feuille growth hojas holcus holcus lanatus leaves lolium perenne macollamiento nitrogen nitrogen content nitrogen fertilizers plant competition poa trivialis senescence tallage teneur en azote tillering uses usos utilisation