BSCI 207 Lecture Notes - Lecture 20: Topsoil, Soil Horizon, Subsoil
26 Jan 2016
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Bsci207 - lecture 20 - nutrient assimilation in plants (in textbook: 25. 1-25. 2) Co2, hydrogen, o2 (from air and water) Mineral nutrients (from soil solution around roots) Plants fix carbon in the leaves and spread it to roots and stems. Make their own sugars but can"t make their own minerals - come from roots (nitrogen) Availability of fixed nitrogen, phosphorous, and potassium often limit plant growth. Water causes erosion and breaks up rocks into smaller particles. Soil formation begins when wind, temperature changes, rain, and organisms break small particles off solid rock. Contains material from topsoil and parent rock. 8 micronutrients (present in small amounts and some toxic in large amounts) Nitrogen deficient plants don"t grow a lot. A culture solution supplies nutrients to the plant. Air is bubbled through the solution to provide oxygen to the roots. Start out with pure distilled water and add nutrients.
