00374    a2200109   4500082001600000245009700016260002400113300001600137440003100153650004100184650003900225  a630.24bCHE  aChemicalisation of plant production in the tropics and subtropicsbpart 1  b fertilization   aLeipzigc1977g1977  a213p.c21cm  a4th scientific conference   aMISCELLANY AND SCIENTIFIC PRINCIPLES  aAGRICULTURE AND RELATED TECHNOLOGY