IE270 1st Edition Lecture 27 Outline of Last Lecture II. 4 classes of animal protein III. LivestockIV. Multi-functionality of livestock in smallholder agriculture V. Environmental burdens of livestock VI. Aquaculture Outline of Current Lecture VII. SOIL Current LectureSoil- For there to be agriculture there must be soil within which the plants can take root and grow- The type of soil can determine what crops will succeed and what will fail - There are several major soil types within the tropics: Kaolinitic, Oxidic, Allophanic, and Smectitic soils. Kaolinitic soils are deeply weathered with a sand, loamy sand, or sandy loam texture in the surface horizon, a clayey B horizon, low silt content and the dominant mineral isthe kaolinite clay mineral- Kaolinite is a 1:1-type layer silicate with mostly hexagonal crystals that range from 0.2 to 2 micrometers in diameter and does not expand upon wetting. - Oxidic soils are strongly weathered red and yellowish, fine textured, contain more Fe than Kaolinitic soils, and typically have a low bulk density- Allophanic soils are dark-colored young soils derived mainly from volcanic ash and have a low bulk density - Smectitic soils are loamy to clayey alluvial soils containing moderate to large amounts of the mineral smectite - Smectite is a 2:1-type layer silicate and shows the greatest interlayer expansion of all clay minerals when wet These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a
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