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ACKNOWLEDGEMENTS


This study is based on the work of Prof. Abdi-Kadir Ergashev, Head of the Agro-ecology Laboratory, Samarkand Agricultural Institute, Samarkand, Uzbekistan.

The study benefited from the contributions of K. Isherwood, J. Poulisse and T. van den Bergen (FAO).

The cover photographs were provided by A.L. Anderberg (alfalfa), C. Borgemeister (wheat) and H.V. Duthurbura (cotton). The source of these photographs is EcoPort (Portal to Ecology Management). The source of the background photograph is "The world's major fibre crops, their cultivation and manuring" (Centre d'étude de l'azote).


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