Lecture 28 Biology 2

Lecture 28 Biology 2 - Lecture 28 Plant nutrition Chapter 37 Plant Nutrition 1 2 3 4 Nutritional requirements of plants The role of soil in plant

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Lecture 28, Plant nutrition March 19, 2008 1 Chapter 37: Plant Nutrition 1. Nutritional requirements of plants 2. The role of soil in plant nutrition 3. The special case of nitrogen 4. Nutritional adaptations Nutritional requirements CO 2 H 2 O O 2 O 2 CO 2 H 2 O Minerals Fig 37.2 Plants are autotrophs , but… Like animals, plants have nutritional needs for growth, maintenance, and reproduction: • Inorganic ions (e.g., NO 3 - ) • Water (O 2 , H) • Carbon dioxide (CO 2 ) 96% of plant dry weight is carbohydrate (CHO’s, including cellulose) Essential Elements : 9 macronutrients, 8 micronutrients ( see Table 37.1 ) Nutritional requirements Macronutrients • Required in relatively large amounts (>0.1% dry weight) • Make up organic material of plant • Carbon, hydrogen, oxygen, nitrogen, sulfur, phosphorus, potassium, calcium, magnesium Micronutrients Very small amounts (<0.1% dry weight) Hydroponics
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Lecture 28, Plant nutrition March 19, 2008 2 Fig. 37.1 Sources of macro nutrients Carbon - C O 2 in air , through stomata Hydrogen and Oxygen H 2 O in soil, C O 2 & O 2 in air • Other macronutrients – N, P, K, Ca, Mg, S – as inorganic ions from soil Nutritional requirements Fig. 36.7 Recall Fig. 36.15b: The mechanism of stomatal opening and closing Roles of some macronutrients Potassium : major solute functioning in water balance; operation of stomata Nutritional requirements Calcium: formation and stability of cell walls Magnesium: component of chlorophyll Thickened cell walls of persimmon seed Nutritional requirements Chlorophyll molecular structure
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Lecture 28, Plant nutrition March 19, 2008 3 Micronutrients (8) • Each makes up < 0.1% dry weight
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This note was uploaded on 03/31/2008 for the course EBIO 1220 taught by Professor Demig-addams during the Spring '07 term at Colorado.

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Lecture 28 Biology 2 - Lecture 28 Plant nutrition Chapter 37 Plant Nutrition 1 2 3 4 Nutritional requirements of plants The role of soil in plant

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