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adequate Africa agricultural arable land areas Asia Australia average basin beneﬁt better breeding cattle cereals climate conservation consumption crop rotation crop yields deﬁciencies desert locust disease drainage East economic eﬂiciency erosion estimated Europe existing extensive factors farmers farming feed ﬁeld ﬁgures ﬁrst ﬁsh ﬁsh production ﬁsheries ﬁshing ﬂood food production food supplies forest grass grasslands grazing high yields important improved varieties increase India irrigation Japan kilograms kilograms per hectare Latin America legumes livestock livestock numbers livestock production locust losses maize manure methods milk million hectares million tons monsoon nitrogen numbers nutrients nutrition output Pakistan pastures percent pests plant plant breeding population possible potential practices present problem protein rainfall regions require result rice savannas scientiﬁc sheep shifting cultivation soil fertility South technical tion tons per hectare tropical underdeveloped United United Arab Republic Uruguay utilization vegetation wheat