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