Fertilizer Guide for Food grains in the tropics and subtropics text Zurich Centre d'Etude de I'Azote 1970 Ing 119 p.: ill.; 19 cm. J.G. De Geus GRAIN CROPS FERTILIZER APPLICATION TROPIZAL ZONES SUBTROPICALZONES GUIDELINES 631.8 631.8 GEU f INLIS000000000003890 Converted from MARCXML to MODS version 3.5 using MARC21slim2MODS3-5.xsl (Revision 1.106 2014/12/19)