00458    a2200145   4500082001600000100001700016245003100033260006000064300001600124440002900140650004100169650002600210650005200236650002400288  a631.83bPER  aPerrenoud, S  aPotassium and plant health  aSwitzerlandbInternational Potash institutec1990g1990  a365p.c21cm  aIPI research topics No.3  aAgriculture and related technologies  aPotassium fertilizers  aFertilizers,soil conditioners,growth regulators  aSpecific techniques