na INLIS000000000003890 Inggris 0010-0621000176 Fertilizer Guide for Food grains in the tropics and subtropics J.G. De Geus Geus, J.G. De Zurich Centre d'Etude de I'Azote 1970 119 p.: ill.; 19 cm. 631.8 GEU f 631.8 GRAIN CROPS FERTILIZER APPLICATION TROPIZAL ZONES SUBTROPICALZONES GUIDELINES 185/KA/2021