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Torsten Mandal specialized in tropical agroforestry, sustainable soil fertility management, soil and water conservation, tree establishment, and crop husbandry.
Torsten Mandal developed, researched, and published new low-cost solution to key-problems of African land-use attractive for small (and large) farmers, forest users and pastoralists.

They include developing and documenting reliable direct field seeding of multipurpose tree legumes (often without transplanting or watering), making sure tree-legumes can:
-fix nitrogen,

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