Memory Game PLSC101 Memory Game 2Online version Lab Group 7 Topics: Soil parts and tillage by cindy s Humus Top layer of soil that is made up of organic matter, water, air and mineral particles Deep tillage to bury residue, followed by shallow tillage to smooth Moldboard Plow Organic component of decomposed leaves and plant material Mollisol Ridge Tillage Made up of decaying animal and plant residue degraded by organisms Conservation Tillage Light tillage to mix up and move crop residue on the surface. No-Till Gravitational Water Mulch Tillage Organic Matter Conventional Tillage Pore Space Soils that are formed under grasslands, very good for crop growth. Topsoil