Introduction

Sorghum is the fifth most important cereal crop and is the dietary staple of more than 500 million people in more than 30 countries. It is grown on 42 m ha in 98 countries of Africa, Asia, Oceania, and the Americas. Nigeria, India, USA, Mexico, Sudan, China and Argentina are the major producers. Other sorghum producing countries are Mauritania, Gambia, Mali, Burkina Faso, Ghana, Niger, Somalia and Yemen, Chad, Sudan, Tanzania and Mozambique.