[Presentation of results, technology test of Zacapa]

allium cepa arachis hypogaea bemisia tabaci cebolla crop residues cultivation cultivo daucus carota fertilisation fertilizer application fitomejoramiento lycopersicon esculentum mosca blanca phaseolus vulgaris plant breeding pratique culturale residuos de cosechas sorghum bicolor sorgo tomate variedades varieties zanahoria zea mays