Cultivation of chat and its impacts in the farming system, household economy and food availability. A case study in Malkaa balloo and Ifa gamachu PSa in Habro district, Eastern Ethiopia

autosuffisance autosuficiencia cash crops catha edulis cultivation cultivo cultivo intercalado cultivo mixto cultivos comerciales culture de rapport culture intercalaire economic analysis economic value ethiopia etiopia farming systems food supply hogares households intercropping mixed cropping plantas estimulantes plante stimulante pratique culturale riesgo risk risque sorghum stimulant crops suministro de alimentos tendance tendencias trends zea mays