Evaluation of mixed sward of Kentucky bluegrass (Poa pratensis L.) and white clover (Trifolium repens L.) for labor-saving grazing in Hokkaido [Japan], 3: The nutrient accumulation process in fertilizer recommendation and the effects of reducing fertilizer application in short grass pasture

abonos azote blood composition composition du sang conduite des herbages cultivo mixto engrais fertilizers fosforo grassland management manejo de praderas mixed cropping nitrogen phosphore phosphorus poa pratensis potasio potassium productividad productivity trifolium repens