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3 items found (Showing 1 - 3)
  1. Key Resource 2016-09-28 Farmers in many parts of the world, because of human population growth, have little choice but to crop their land continuously, with scarce resources to replace nutrients withdrawn by each successive crop. Crop residues are often lost as a source of organic matter and mulch, usually through...  
  2. Key Resource 1992-03-01 Water is everywhere - its physics and chemistry, rain, evaporation, infiltration, underground, the intimate relationship between life and water, and other natural phenomena. Its effects and applications need to be understood: run-off, erosion, soil drainage and irrigation. These comprise the main...  
  3. Key Resource 1996-09-01 Indigenous soil and water conservation practices are rarely acknowledged in the design of conventional development projects. Instead, the history of soil and water conservation in Africa has been one of imposing external solutions without regard for local practice. There is a remarkably diverse...  

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