Ch. 37 Plant Nutrition

Ch. 37 Plant Nutrition - Plant Nutrition Chapter 37 Key...

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Plant Nutrition Chapter 37
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Key Terms for Chapter 37 Macronutrients-Carbon, Hydrogen, Oxygen: Know roles Nitrogen, Phosphorus, Potassium: why a problem? Know roles Fertilizers: organic vs. Inorganic Cationic exchange Sustainable agriculture Nitrogen cycle (bacteria dependent) Soil horizons PH and soil Soil composition-sand, clay and silt Root nodules-rhizobium and mycorrhizae
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Plant Nutrients: Where do they come from? Plants require 3 elements to build macromolecules: C, H, and O Carbon-comes from CO2 in the atmosphere Hydrogen-comes from water via the roots Oxygen-comes from water via the roots All other minerals are dissolved in the soil
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Most Problematic: N,P,K Fertilizers Contain N,P, and K in various amounts (10-10-10 or 5-10-5) Nitrogen: rapid vegetative growth (leaves); spinach, lettuce, grass; supplied as NO3 or NH4 Phosphorus: flowers and fruits; bulbs; supplied as bone meal or phosphoric acid Potassium: balance between N and P; root crops and bulbs; potatoes and beets; supplied as potash (K2O)
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