[Annual report 1985-86: maize, bean, sorghum, vegetables; technology test, Chiquimula]

abonos arroz crop yield engrais fertilisation fertilizer application fertilizers herbicidas herbicide herbicides malezas mauvaise herbe oryza sativa pests of plants phaseolus vulgaris plagas plagas de plantas ravageur des plantes rendement des cultures rendimiento de cultivos sorghum bicolor sorgo tomate variedades varieties weeds