ven101c_irrigation_water_management_lecture_082

ven101c_irrigation_water_management_lecture_082 - 5/29/2009...

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5/29/2009 1 David R Smar VEN 101C 2009 David R. Smart Irrigation Water Management drsmart@ucdavis.edu 2142 RMI North Monday 9:30 11:30 754 7143/754 7144 Soil-Plant-Atmosphere Continuum Water Use & Transpiration Photosynthesis/transpiration Compromise Turgor and expansive growth Solvent for biochemical process Medium for nutrient absorption Major constituent of wine! Evaporation: :Transpiration H 2 O CO 2
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5/29/2009 2 Moderate Water Deficits Reduce vegetative growth – Shoot and lateral length – No. of lateral shoots Increase light in canopy Early senescence lower leaves 1103P dryland 1103P deficit 101-14 Mgt. dryland 101-14 Mgt. deficit 1103P full 101-14 Mgt. full Deficit Irrigation % of 100% ET Treatmen % of 100% ETc Treatment Variable 40 60 80 100 Pruning Wt 52 62 85 100 Yield 79 95 105 100 Deficit Irrigation % of 100% ETc Treatment Variable 25 50 75 100 Berry Size 84 93 97 100 Moderate Water Deficits Improves expression of flavo Improves expression of flavor – Mechanism mostly unknown – Diminish methoxy-pyrazine eg. Improves color, light in canopy
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5/29/2009 3 Severe Water Deficits Xylary Embolism Xylary Embolism: – Breaks soil-plant-atmosphere continuum – Collapse of water column – Lysis and tissue death Irrigation Systems
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5/29/2009 4 Well Head Pressures 20 Feet Electrical and Controls 110VAC 220VAC 440VAC Power Line Generator Gas Diesel Main Line Submain Lateral Wel Motor Pump Impel ers 300 Feet 500 Feet Turbine Pump Chemical Feed System with Inline (Static) Mixer Well Pump Maintenance Electric Power 220, 440VAC Pulling the Pump
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5/29/2009 5 Pump Motor and Impellers Electric Motor and Impellers Blue-Stripe PVC Lateral Tubing Drip Emitter Drip Emitters Irrigation Scheduling Two major decisions: – When to begin irrigating?
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This note was uploaded on 09/29/2010 for the course VEN 101C 91861 taught by Professor Davidsmart during the Spring '09 term at UC Davis.

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ven101c_irrigation_water_management_lecture_082 - 5/29/2009...

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