Lecture_10_Plant_nutrition

Lecture_10_Plant_nutrition - Biology 230 Jennifer Breckler...

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Biology 230 Jennifer Breckler Plant nutrition Chap 37 Campbell 8e
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Concepts and terms • Besides light for photosynthesis, typical land plants need soil, water and air to grow • Plants consist mainly of water • Plant ‘dry’ mass is mainly organic (carbon-based molecules such as carbohydrates) which are products of photosynthesis and originate from CO 2 in the air • Plant inorganic nutrients are derived from soil: 9 essential macronutrients (COHNPS for organic molecules+ KCaMg) and 8 essential micronutrients (ClFeMnBZnCuNiMo) • Some micro-organisms provide nutrition to plants
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Typical plant mass 90% water 10% dry mass
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Dry mass contents: 96% is carbohydrate (CH 2 0), such as sucrose 1. C is derived from CO 2 in air 2. H is derived from water in soil 3. O is derived from both water and CO 2 4% is other elements from soil such as nitrogen, sulfur or phosphorus, and these are used to make other macromolecules.
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Fig. 37-1 No soil No plant growth Importance of soil
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Fig. 37-14a Staghorn fern, an epiphyte Interesting plant adaptations: epiphyte needs no soil
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Fig. 37-4a Land subsidence in California Soil levels can drop….here 30ft Land subsidence (land sinking) here is caused by removal of underlying groundwater sources ( aquifers ) for crop irrigation In California, aquifers are the main agricultural water source. Rivers and lakes Supply some water.
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Fig. 37-4b Sinkhole in Florida Sudden land subsidence can be hazardous as well as cause soil loss. This event was caused by drained aquifers.
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Agriculture supplies us with food. We need sustainable agriculture so our global soil stays healthy enough to continue to produce food. Thirty% of the world’s soil is becoming depleted due to
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This note was uploaded on 11/28/2011 for the course BIOL 230 taught by Professor J.breckler during the Spring '11 term at S.F. State.

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Lecture_10_Plant_nutrition - Biology 230 Jennifer Breckler...

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