Small-scale irrigation technology, such as motorized pumps and hosing to access groundwater, could cost a sub-Saharan African smallholder $250 or more but could improve crop yields by between 75 and 275 percent, the report said.
"Factors are working to potentially move the world into another food crisis like 2007-2008, triggered by a U.S. drought and the late onset and irregularity of the South Asian monsoon," Colin Chartres, IWMI director general, said in an interview.
"If there is more investment in small-scale irrigation, it means food supply in those countries is more secure. It won't replace the need for staple cereal crops, but it gives farmers more insurance against a food crisis."
Small-scale irrigation schemes usually cover areas less than 2 hectares. Farmers largely initiate and finance irrigation equipment individually or in small groups and use low-cost technologies such as buckets, watering cans and pumps.
In Ghana, around 185,000 hectares are under small-scale irrigation schemes, benefiting half a million smallholders, and some 170,000 farmers in Burkina Faso water vegetable crops in the dry season using small-scale irrigation, the IWMI estimates.
Vegetable production has nearly tripled in the Burkina Faso to 160,000 tonnes in 2005 from 60,000 tonnes in 1996 and is still growing, the report said.
FOOD, WATER TOP THE AGENDA
Food and water security are high on the world's agenda as the United States experiences its driest summer since the 1930s, sending grain prices to all-time highs and raising the spectre of a food crisis such as in 2008.
Climate change is also increasing the uncertainty of rainfall, meaning that groundwater supplies are not being replenished and rainwater is difficult to collect to feed crops.
The majority of the world's poor live in South Asia and sub-Saharan Africa and most of these people live in rural areas and work in agriculture. More
