Agricultural biodiversity is a precious legacy which we have a moral duty to pass on intact to future generations. As farming systems modernise, these crucial resources risk being lost, unless effective conservation measures are put in place and sufficient recognition is given to the role of the farmer in food security and agricultural development. This publication contains a number of black and white photographs by Pablo Balbontân Arenas, which give an insight into the life and customs of small farmers who foster, maintain and use genetic diversity in traditional agricultural systems, deploying local techniques and knowledge accumulated over many centuries, focusing on four crops: wheat, rice, maize and potato. The accompanying text is written in English, Spanish and Italian.

Incidence and intensity of drought and low N stresss in the tropics; Case studies strategies for crop production under drought and low n stresses in the tropics; Stress physology and identification of secondary traits; Physiology of low nitrogen stress; Breeding for tolerance to drought and low n stresses; General breeding strategies for stress tolerance; Progress in breeding drought tolerance; Progress in breeding low nitrogen tolerance; Experimental design and software.