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