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Plant Nutrition

Plant Nutrition. Nutritional needs. Autotrophic plants need… sun as an energy source inorganic compounds as raw materials water (H 2 O) CO 2 minerals. Macronutrients. Plants require these nutrients in relatively large amounts C, O, H, N, P, K, Ca, Mg, S. For what & from where?.

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Plant Nutrition

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  1. Plant Nutrition

  2. Nutritional needs • Autotrophic • plants need… • sun as an energy source • inorganiccompounds as raw materials • water (H2O) • CO2 • minerals

  3. Macronutrients • Plants require these nutrients in relatively large amounts • C, O, H, N, P, K, Ca, Mg, S

  4. For what & from where?

  5. Micronutrients • Plants require in very small amounts • Cl, Fe, Mn, Bo, Zi, Ni, Mb • primarily cofactors for enzyme function

  6. Nutrient deficiencies • Lack of essential nutrients • exhibit specific symptoms • dependent on function of nutrient • dependent on solubility of nutrient

  7. Magnesium deficiency • Symptoms • chlorosis = yellowing of leaves • Why? What is magnesium’s function?

  8. The role of soils • Plants are dependent on soil quality • texture / structure • relative amounts of various sizes of soil particles • composition • organic & inorganic chemical components • fertility

  9. organic matter • Topsoil • most important to plant growth • rich in organic matter • humus • decomposing organic material • breakdown of dead organisms, feces, fallen leaves & other organic refuse by bacteria & fungi • improves soil texture • reservoir of minerals • organisms • 1 tsp. of topsoil has ~5 billion bacteria living with fungi, algae, protists, insects, earthworms, nematodes

  10. Fertilizers • “Organic” fertilizers • manure, compost, fishmeal • “Chemical” fertilizers • commercially manufactured • N-P-K (ex. 15-10-5) • 15% nitrogen • 10% phosphorus • 5% potassium

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