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Mechanics and Related Processes in Structured Agricultural Soils (Paperback, Softcover reprint of the original 1st ed. 1989)
Loot Price: R4,225
Discovery Miles 42 250
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Mechanics and Related Processes in Structured Agricultural Soils (Paperback, Softcover reprint of the original 1st ed. 1989)
Series: NATO Science Series E:, 172
Expected to ship within 10 - 15 working days
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Agricultural soils are subjected to many applied mechanical
stresses that influence their behavior. Stresses arise from tillage
machines, seeders and chemicals applicators, tractors, and
equipment for harvest and transport. Applied stresses may compact
or loosen the bulk soil. Micro sections of soil (aggregates or
clods) may be compacted during tillage while the bulk soil is
loosened. Because most granular soils are combined into structural
units of varying sizes with different strengths and properties,
prediction of the effect of stresses on the behavior of bulk soils
is difficult. The basic strength properties of soil are determined
by many fac tors: the size distribution of particles, chemical and
mineralogical properties of inorganic clay fraction, the organic
matter content and composition, the water content and the stress
history. These factors combine and interact to produce many
possible behavior patterns. Changes in structure of the soil from
applied stresses and biologi cal reactions may profoundly influence
storage and transmission of water, heat, and air, and the
mechanical resistance to penetration by plant roots. They may also
affect the traction of vehicles. Manipulation of structural
properties of soils by tillage implements is a major cost under
most crop production systems. Reduced energy use is also a
significant conservation objective. Improved management systems are
very dependent upon a better understanding of soils' response to
applied stresses. The content of this book resulted from a NATO
Advanced Research Workshop held in St. Paul, Minnesota, U.S.A.
September 13-16, 1988."
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