[Combined liming and fertilizer trials. Results 1983-97]

abonos fosfatados abonos nitrogenados analyse de sol azote calcio calcium chaulage chemical composition composition chimique crop yield cultivos de primavera culture de printemps encalado fertilisation fertilizer application fosforo hordeum leys liming nitrogen nitrogen fertilizers noruega norway ph phosphate fertilizers phosphore phosphorus pradera temporal prairie temporaire rendement des cultures rendimiento de cultivos soil testing spring crops textural soil types tipos texturales de suelos triticum type de sol textural