Changes in certain biological soil properties under the monoculture of tall fescue and its mixture with white clover in the conditions of mineral nutrition

abonos nitrogenados ammonitrate analyse de sol analyse microbiologique application rates biologie du sol calcium ammonium nitrate cultivo mixto dose d'application fertilisation fertilizer application festuca arundinacea fosforo microbiological analysis mineralisation mineralization mixed cropping nitrogen fertilizers organic matter ph phosphore phosphorus potasio potassium soil biology soil testing trifolium repens