RRES_150_Slides_Part_3 - RRES 150 Part 3 Environment in...

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RRES 150 Part 3 Environment in Horticulture (continued)
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herbaceous plants woody plants 85-95% water 75-85% water PROPERTIES OF WATER PLANT CONTENT Page 60
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Functions of Water 1) solvent - dissolves solutes; the cytosol of the cytoplasm is a water solution of dissolved solutes. 2) reagent - water is used in biochemical reactions, such as photosynthesis. 3) translocation medium - water translocates solutes in xylem and phloem. 4) temperature relations - water is very important in regulating temperature. 5) turgor pressure and growth Image from: www.progressivegardens.com/ knowledge_tree/bio101.html Page 60
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Temperature Regulation by Water a) stabilizes plants and environment (due to high specific heat) b) evaporative cooling (due to heat of vaporization) c) releases heat when freezes (due to heat of fusion) d) constant temperature during phase change - freezing/melting water/ice water stays at 32 F. Page 60
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Turgor turgor pressure - the positive pressure inside of cells due to water uptake. a) turgor pressure is due to osmosis. b) turgor pressure keeps cells expanded c) turgor pressure keeps herbaceous plants and plant parts erect d) turgor pressure is the driving force for growth in size by causing cell expansion. growth - an irreversible increase in size or mass. Page 60
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Turgor (continued) plasmolysis - shrinkage of individual cells due to loss of turgor pressure that causes a cell to become flaccid. wilting - excessive water loss that causes loss of plant rigidity; caused by plasmolysis of enough individual cells to cause the organ to be limp. Page 60
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Humidity humidity - amount of water vapor in air; can be expressed as: a) absolute humidity - amount of water vapor in air expressed as grams water per cubic meter of air (g/m 3 ) b) specific humidity - amount of water vapor in air expressed as grams water per kilogram of air (g/kg) c) relative humidity - amount of water vapor in air expressed as a percentage of the amount of water vapor that could be held at saturation. d) vapor pressure - amount of water vapor in air expressed as the downward pressure exerted by the water vapor present in the atmosphere. (1-55 mm Hg). www.physicalgeography.net/fundamentals/8c.html Page 61
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Relationship between humidity and temperature dew point - the temperature where relative humidity equals 100%. condensation - conversion of water vapor to liquid or ice; condensation occurs when the temperature drops below the current dew point. From: ces.purdue.edu Page 61
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TYPES OF CONDENSATION 1. dew - condensation of water onto solid surfaces 2. fog - condensation of water into small droplets that stay suspended in air close to the earth's surface. 3. cloud - condensation of water into small droplets that stay suspended in air high in the atmosphere. Page 61
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Precipitation precipitation - loss of atmospheric water occurs when condensation is extensive enough that the water or ice coalesce to form droplets/crystals that fall from the atmosphere due to the force of gravity as temperature decreases the absolute or specific humidity at
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This note was uploaded on 05/13/2011 for the course RRES 150 taught by Professor N/a during the Spring '11 term at University of Louisiana at Lafayette.

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RRES_150_Slides_Part_3 - RRES 150 Part 3 Environment in...

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