AGRO 2051 Lecture Notes - Lecture 3: Allophane, Dic Entertainment, Cascina Increa
Document Summary
Soil colloids are minute and, therefore, have a large surface area per unit mass. Soil colloids also carry electrostatic charges (- and +) that are balanced by adsorbed cations and anions. Layer aluminosilicates which consist of thin layers of repeated structural units. These are the dominant clay minerals in temperate regions. Basic units are the si tetrahedron and the al (or. Many tetrahedra are linked together to form a si tetrahedral sheet and many octahedra are similarly form an octahedral sheet. In turn, these different sheets are bonded together to form crystalline units. linked to. Al and fe oxides which may be crystalline or amorphous. These are common in subtropical and tropical regions. (humus) which are 3d non- Composed of alternating sheets of si tetrahedra and al (or mg) octahedra. The octahedral sheet is called dioctahedral if al is the central metal atom or trioctahedral if it is mg.
