00560nam a2200181 a 450000100080000000500110000800800410001910000180006024500980007826000600017630000090023649000270024565000230027265000250029565000240032070000160034470000180036010397372014-02-22       1977    bl uuuu     u00u1 u    #d1 aGARWOOD, E.A.  aA comparison of yield and soil conditions during 20 years of grazed grass and arable cropping  aHurley (Inglaterra): Grassland Research Institutec1977  a90p.  aTechnical Report (GRI)  aANALISIS DEL SUELO  aFERTILIDAD DEL SUELO  aSUELO DE PASTIZALES1 aTYSON, K.C.1 aCLEMENT, C.R.