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J.Watering

J.Watering - Watering Watering Plant Use Water Quality...

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1 Watering Watering Plant Use Water Quality Irrigation Strategies Irrigation Systems Water: Plant Use Necessary for cell expansion ü Only way leaves can expand Critical during floral initiation Plant Water Stress 1.Slight stress ü Smaller leaves 2.Moderate stress ü Smaller plants
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2 Watering Plant Water Stress 3.Temporary wilt ü Recovers after watering 4.Permanent wilt ü Will not recover Water Quality Good water makes good plants! Poor quality leads to poor plants Can be expensive to correct $$$$$$ Why do we worry about poor quality water? Causes foliage residues Causes pH and EC problems Reduces effectiveness of chemical sprays Reduces propagation success
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3 Watering Factors to Check pH EC Alkalinity Nutrient Content Contaminants Pathogens pH: Too High Iron Deficiency Alkalinity Irrigation water alkalinity is the major factor regulating pH rise in the substrate. Not the irrigation water pH! It is dissolved limestone in the water
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4 Watering Alkalinity Values Carbonates & Bicarbonates 1 meq/L = 61 ppm of bicarbonate = 50 ppm calcium carbonate < 2meq/l Alkalinity and pH Substrate pH 8.5 8.0 7.5 7.0 6.5 6.0 5.5 5.0 4.5 Time Hi Alk, Hi pH Hi Alk, Low pH Low Alk, Hi pH Low Alk, Low pH Alkalinity vs pH Grower A pH = 9.3 Alk = 1.42 meq/l Grower B pH = 8.3 Alk = 6.20 meq/l Target pH 5.8 20 oz acid 88 oz acid 4X
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5 Watering High Alkalinity/pH Small problem: Fertilizer management- NH 4 -based Large problem: Acid injection Treatments for High Alkalinity/pH Small problem: Fertilizer management- NH 4 -based Large problem: Acid injection Acid Injection
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6 Watering Correcting Problems Treat water Re-drill well or drill another well Find another source Contaminants Herbicides ü Are you using surface water? Water Quality Summary High priority Poor quality water with you everyday Use filters to reduce sediment Consider $/gallon in addition to total cost.
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7 Watering Water “Loss” 40% loss of water applied 90% loss of
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J.Watering - Watering Watering Plant Use Water Quality...

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