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Plant & Soil Science. Plant Growth. Roots grow down towards gravity Stems grow up away from gravity Stems grow up towards light. Plant Growth. Talk or breathe on plants to give them carbon dioxide Roots need both water and oxygen in the soil to live. Terrariums.
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Plant Growth • Roots grow down towards gravity • Stems grow up away from gravity • Stems grow up towards light
Plant Growth • Talk or breathe on plants to give them carbon dioxide • Roots need both water and oxygen in the soil to live
Terrariums • Enclosed clear container growing plants inside • Creates its own rain cycle • Only needs water maybe 1-2 times a year • If too much water is in the terrarium, remove the cover so some water can evaporate out
Terrariums • Set in a bright area, but not direct sunlight • Too much sunlight will heat the terrarium up so it is too hot for a plant to live
Earth as a Fruit • Earth’s surface • 75% covered with water • 97% of this water is salt water • 25% covered by land • Most land unusable for growing crops (to hot, cold, wet, dry, mountainous, covered by buildings and roads, poor soils)
Items Needed for Plant Growth • Soil • Oxygen – (O2) • Carbon Dioxide – (CO2) • Water – (H2O) • Sunlight • Correct temperature
Soil • Layer of organic matter, inorganic matter, water, and air that supports plant life
Inorganic Soil Particles • Sand • Largest soil particle • Feels gritty • Good because it lets air and water in • Bad because too much sand does not hold water well • Silt • Medium soil particle • Feels soft
Inorganic Soil Particles • Clay • Smallest soil particle • Feels like rock when dry • Good because it holds water well • Bad because too much clay does not let air in and roots have a difficult time growing
Soil Layers • Topsoil • Uppermost layer of soil, dark in color, high in nutrients • Subsoil • Below the topsoil, lighter in color, low in nutrients • Bedrock • Layer of solid rock • Soil Cup Treat