Tillage

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Principles of Soil Conservation and Management
85,59 € In den Warenkorb
Peasants, Farmers and Scientists
165,84 € In den Warenkorb
Peasants, Farmers and Scientists
171,19 € In den Warenkorb
Green Manure/Cover Crop Systems of Smallholder Farmers
213,99 € In den Warenkorb
Physical Methods in Agriculture
192,59 € In den Warenkorb
$Honighäuschen (Bonn) - Agricultural soils are subjected to many applied mechanical stresses that influence their behavior. Stresses arise from tillage machines, seeders and chemicals applicators, tractors, and equipment for harvest and transport. Applied stresses may compact or loosen the bulk soil. Micro sections of soil (aggregates or clods) may be compacted during tillage while the bulk soil is loosened. Because most granular soils are combined into structural units of varying sizes with different strengths and properties, prediction of the effect of stresses on the behavior of bulk soils is difficult. The basic strength properties of soil are determined by many fac tors: the size distribution of particles, chemical and mineralogical properties of inorganic clay fraction, the organic matter content and composition, the water content and the stress history. These factors combine and interact to produce many possible behavior patterns. Changes in structure of the soil from applied stresses and biologi cal reactions may profoundly influence storage and transmission of water, heat, and air, and the mechanical resistance to penetration by plant roots. They may also affect the traction of vehicles. Manipulation of structural properties of soils by tillage implements is a major cost under most crop production systems. Reduced energy use is also a significant conservation objective. Improved management systems are very dependent upon a better understanding of soils' response to applied stresses. The content of this book resulted from a NATO Advanced Research Workshop held in St. Paul, Minnesota, U.S.A. September 13-16, 1988.$
Mechanics and Related Processes in Structured Agricultural Soils
181,89 € In den Warenkorb
Principles of Soil Conservation and Management
320,99 € In den Warenkorb
Sustainable Agriculture Reviews 33
149,79 € In den Warenkorb

Asiatische Hornisse in der Region Bonn und Rhein-Sieg aufgetaucht

Tillage

Principles of Soil Conservation and Management

Peasants, Farmers and Scientists

Peasants, Farmers and Scientists

Green Manure/Cover Crop Systems of Smallholder Farmers

Physical Methods in Agriculture

Mechanics and Related Processes in Structured Agricultural Soils

Principles of Soil Conservation and Management

Sustainable Agriculture Reviews 33

Querdenker, Wespen und aculeate Hymenopteren

Dachdecker trifft Baumhummel – was tun?

Filialisierung bei Hornissen

Wildbienen, Bienenhotels und Kindergärten – Gehören Wildbienen zu Deutschland?

Ein Hornissennest in einem Rollladenkasten

Hilfe, eine riesige Hornisse baut bei mir