00444    a2200121   4500082001600000245008700016260006000103300001600163650002600179650005200205650004100257650002400298  a631.83bNUT  aNutrient balances and the need for potassiumbproceedings of the 13th IPI-Congress  aSwitzerlandbInternational potash institutec1986g1986  a299p.c23cm  aPotassium fertilizers  aFertilizers,soil conditioners,growth regulators  aAgriculture and related technologies  aSpecific techniques