SEMI-ARID PRODUCTION SYSTEMS

These are found in regions where the mean monthly temperature is above 18 ^oC and where there is one or more season during which evapotranspiration exceeds precipitation. Although the mean annual rainfall is in the range 400-1,200 mm, lack of water is a major constraint to production.

These regions often have large populations of small-scale farmers and occupy large areas of many countries addressed by the PSP's research.

     PSP Research activities:

• Improving methods for production of hybrid rice.
• Overcoming pests and diseases by genetic modification of crops.
• Using molecular markers to improve the organisation of germplasm collections.
• Developing and disseminating salt-tolerant wheat cultivars.

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