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