00369nam a2200109Ia 4500008004100000082003200041245006800073260004700141300001000188600001800198650004300216130903s9999    xx            000 0 und d  a633.1:631.816(213)(026)  L0  aFertilizer guide for food grains in the tropics and subtropics.  aZurichbCentre d' Etude de I'Azotecc 1970  a119p.  aGeus De, J.G.  aFertilizers and manures,Tropical crops