Izimakethe zokulima zase-Afrika zinikeza amathuba amakhulu kubantu abathenga amabhande kakotini futhi abafuna izindlela ezithembekile, ezingabizi kakhulu zokupakisha izimpahla zabo. INigeria, i-Egypt, iMali, neBurkina Faso zitshala amathani kakotini angaba yizigidi ezingu-1.5 unyaka ngamunye, okusho ukuthi isidingo sezinto zokubopha zekhwalithi ephezulu.