AGRO 2051 Chapter : Soil Science
Document Summary
O,a: very small mineral particles clay. Yes: soil colloids have high surface area per unit mass, primary and secondary minerals, primary. How does structure deelope: adhesive effect of oraniv substances, flocculating cations, shrink-swell clays. B horizon of soil x is red and b horiszon of soil y is yellow with grey mottles. The capacity to absorb chemicals is greatest in sold that have which texture: clay for greaters surface area. Surface structure management: aggregate stability favored by, organic matter, flocculating catios, have control over these. May be destroyed by rain or tillage and traffic, leading to a crust. Tillage when soil is too wet can puddle it: especially clay soil. Soil consistence: resistance of soil to mechanical stress. Judged at different moisture contents: moist soild, loose, very friable, friable (easily crushed, firm, very firm. Particle density ps = mass soild soilds/volume soilds (g/cm^3: depends on mineralogy to some extent, measure by displacement.
