Plants need phosphorus to build nucleic acids, phospholiqids, and ATP Potassium ions activate many of the enzymes essential for photosynthesis and respiration Plants also utilize calcium magnesium and sulfur Calcium ions are essential for building cell walls Magnesium ions are essential for the formation of chlorophyll Cluster of CHo in chlorophyll b in membrane Porphyrin ring (light-absorbing C-CH, head"of molecule) Thylakoid CH? drocarbon tai atoms not shown on, nc. publishing as Benjamin Cummings
• Plants need phosphorus to build nucleic acids, phospholiqids, and ATP. • Potassium ions activate many of the enzymes essential for photosynthesis and respiration. • Plants also utilize calcium, magnesium, and sulfur • Calcium ions are essential for building cell walls. • Magnesium ions are essential for the formation of chlorophyll
15.3 Soil fertility is determined by soil structure and nutrient retention Topsoil usually Soil Layers contains sand. silt and clay. 3 0 Horizon(humus Fertile topsoil is a A Horizon (topsoil E Horizon (eluviation layer) mixture of at least four components I B Horizon(subsoil mineral particles water, ar, organIC C Horizon (regolith matter R Horizon(bedrock EnchantedLearning. com
15.3 Soil fertility is determined by soil structure and nutrient retention • Topsoil usually contains sand, silt, and clay. • Fertile topsoil is a mixture of at least four components: mineral particles, water, air, organic matter