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Soil erosion is a major environmental threat to the sustainability and productive capacity of agriculture. During the last 40 years, nearly one-third of the world's arable land has been lost by erosion and continues to be lost at a rate of more than 10 million hectares per year. With the addition of a quarter of a million people each day, the world(More)
Introduction Soils are dynamic and immensely variable resources. Soils can be thought of as an active chemical factory, full of life, but various organic substances and clays are among the products of the factory. These products are important in providing the soils with the properties that make them a natural resource, such as water and nutrient storage and(More)
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