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By Anthony S. R. Juo, Kathrin Franzluebbers

Agricultural ecology, or agroecology, bargains typically with the constitution and serve as of agroecosystems at various degrees of answer. during this text/reference, the authors describe when it comes to agroecology the tropical environments of sub-Saharan Africa, Southeast Asia, and Latin and crucial the USA, concentrating on creation and administration structures distinct to every sector.

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Extra resources for Tropical Soils: Properties and Management for Sustainable Agriculture

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The type and amount of soil colloids influence the chemical and physical properties of the soil. Major clay minerals found in tropical soils are kaolinite and Fe and Al oxides in strongly weathered upland soils, allophane in volcanic soils, and smectite in young alluvial soils. 3 Soil Chemistry Soil chemistry deals with the chemical properties and reactions of soils. It is essentially the application of electrochemistry and colloid chemistry to soil systems. Major topics include surface charge properties of soil colloids, cation and anion sorption and exchange, soil acidity, soil alkalinity, soil salinity, and the effects of these chemical properties and processes on soil biological activity, plant growth, and environmental quality.

These three groups of minerals are present in the heavy specific gravity fractions, and their weathering is one of the major processes of Mg and Fe cycling. Their relative ease of weathering makes them an excellent source of minerals for Ca, Mg, and trace elements in soils. 3 Secondary Minerals Secondary minerals are minerals that are weathering products of primary minerals. These minerals occur in the clay fraction of the soil. They are also known as clay minerals. The type and amount of these minerals influence the chemical and Mineralogy 21 physical properties of the soil.

3-1). These relationships may be illustrated by the simplified pH-titration curves of a soil dominated by variable-charge colloids. The pH value where the soil particles bear no net electrical charge is called the point of zero net charge (PZNC). At Figure 3-1 The pH-titration curves of two soils dominated by variable-charge colloids depicting the sign and magnitude of surface charges as influenced by pH and electrolyte concentration in soil solution, (a) Ikom, an Alfisol (Rodustalf) rich in Fe oxides in the clay fraction, (b) Alagba, an Alfisol (Kandiustalf) dominated by kaolinite in the clay fraction.

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