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