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...Introduction sadc food agriculture and natural resources fanr the region is periodically confronted with disruptions in security caused by climatic political social economic problems programme currently based harare objectives of main objective regional early warning system to provide member states international community advance information on prospects through assessments expected production supplies requirements factors affecting crop there are many that influence how well plants grow develop these sometimes used farmer make decisions it beyond scope this presentation list every factor affects however a basic types attempted soil fertility levels nutrients depth moisture etc pest historical or current infestations fungus bacterial diseases insects weeds management rotation practices fertilizer pesticide applications tillage technological use farm implements improved seed irrigation conservation methods weather rainfall insolation temperature humidity long range patterns frost length...