Evidence is presented to show that adoption of modern wheat varieties in rainfed marginal environments of the developing world has lagged substantially compared to adoption in favoured well-watered areas. Possible reasons ...

Up to the year 2000 and beyond, the population of SSA is expected to grow at a rate of more than 3% per year, while food production is likely to grow at a rate of 2% or less a year. Closing this gap and increasing food ...