Lec11MineralNutritionNotes

Lec11MineralNutritionNotes - Wednesday afternoon If you...

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Wednesday afternoon If you want to chat about projects PLEASE MAKE AND APPOINTMENT for between 3:30 and 5 pm Wednesday Mineral Nutrition
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Why are there no rain tanks in Davis? Mineral Nutrition http://greenwatersystemsusa.com/graphics /tanks/2500gallon.html
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Help with Back of the envelope calculations Units and dimensions… Why is rainfall measured in units of length like inches or mm? Same with ETo (mm day -1 )? Mineral Nutrition
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Help with Back of the envelope calculations Units and dimensions… Mineral Nutrition Davis rainfall is 19.6 inches (per year) 19.6 inches * 25.4 mm inch -1 = 498 mm That is a depth i.e. if the rainfall fell into a cylinder it would be 498 mm deep So how much is that per m 2 ? 1m 2 is a surface area, 498mm is a depth…multiply the two together and you get a volume
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Help with Back of the envelope calculations Units and dimensions… Mineral Nutrition Start by using the same units (lets use both mm and m for the illustration): 1m 2 = 1000mmX1000mm Volume=1000mmX1000mmX498mm =498 000 000 mm 3 How many liters is that? 1 liter is 1000ml and 1ml is 1cm 3 and 1cm 3 is 10x10x10mm 1 L = 1000ml X 1cm 3 ml -1 X 1000mm 3 cm -3 1 L = 1000 000 mm 3 Thus L = 498 000 000 mm 3 / 1000 000 mm 3 L -1 or 498 L 498 mm = 0.498m Volume=1 m 2 X 0.498m = 0.498 m 3 How many liters is that? 1m 3 is 100X100X100cm 3 ,1L is 1000ml, 1ml=1cm 3 1m 3 = 1000 000 cm 3 X 1L 1000ml -1 X 1ml 1cm -3 1m 3 = 1000 L Thus L = 0.498m 3 X 1000 L m -3 or 498 L So 1mm of rain is 1L of water falling on 1m 2 using mm using m
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How much roof area do I need to gather rainfall (winter) for storage in a tank, so that I can water my garden during summer? Facts: Vegetable garden is 5 by 10 m (= 50m 2 ~500 sqft) Facts: 498mm fall during winter in Davis (= 498L H 2 O m -2 year -1 ) Range of answer: 1 to 1000m 2 of roof Equation? a/A = b/B Need water use of garden (L m -2 year -1 ) Assumption or data: ETo is 5.7 mm day -1 (CIMIS) WU = 5.7 mm day -1 X 182 days (in summer) = 1037 mm season -1 WU (L m -2 year -1 )=1037 L m -2 year -1 (1mm in 1m 2 is = 1L m -2 ) Area roof (m 2 ) = area garden X water lawn used / water stored = 50 X 1037 / 498 = 104m 2 (that’s my entire house area) Would need 51850 L storage tank http://wwwcimis.water.ca.gov/cimis/pdf/etomap1.pdf area roof area garden Winter Summer water stored ET rain area garden X water transpired = area roof X water stored m 2 X L m -2 year -1 = m 2 X L m -2 year -1 http://greenwatersystemsusa.com/gra phics/tanks/2500gallon.html
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Why are there no rain tanks in Davis? Mineral Nutrition http://greenwatersystem susa.com/graphics/tank s/2500gallon.html
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Multipliers Area used to supply crop area with runoff water =area of runoff area of crop Mineral Nutrition 5 1
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EHUF and multipliers http://en.wikipedia.org/wiki/File:Treelawn2.JPG
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Mineral Nutrition Essential elements Specific roles of essential elements Nutrient availability Root-Soil interactions Mycorrhizae Mineral Nutrition
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Stoichiometry Soil O – 467,000 Si – 270,000 Al – 81,000 Fe – 50,000 Ca Mg K Na P S N Glucose is C 6 H 12 O 6 Air N 2 780,840 O 2 209,460 Ar 9340 CO 2 390 Ne 18 He 5 CH 4 1.8 Kr 1.1 H 2 N 2 O CO Xe O 3 NO 2 I 2 NH 3 O=C=O 532kJ mol -1 1Ł1 ±²³N- PRO -1 H-O-H 460kJ mol -1 H-bonds 23kJ mol -1 Bond dissociation energy Out of 1000 0000
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