Lec10TranspirationAndWaterStress

5 cm transpiration httpseedsthompson morgancom et

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Unformatted text preview: deterem the ETcrop by weighing plant. ET-based Irrigation Scheduling • How to determine ETCrop (of a potted plant) – Water potted plant and let drain completely – Weigh potted plant – Place in growing area for 24 hours – Weigh again – Weight • 1 g = 1 ml = 1cm3 of water – Water lost (cm3) ÷ surface area (cm2) = ETCrop (cm) • For example: 200cm3 ÷ 400 cm2 = 0.5 cm Transpiration http://seeds.thompson-morgan.com/ ET-based Irrigation Scheduling if Kc= 0.5 ET0= 3 • Crop Coefficients = KC ETcrop= Kc*ET0= 1.5 – KC = ETCrop ÷ ET0 – If ET0 = 2 cm, then using KC = ETCrop ÷ ET0: • KC = 0.5 cm ÷ 2 cm = 0.25 – Dimensionless number (usually between .1 and 1.2) that is multiplied by the ET0 value to arrive at a crop ET (ETCrop) estimate Transpiration ET-based Irrigation Scheduling • Crop Coefficients = KC – ETCrop = KC x ET0 Transpiration ET-based Irrigation Scheduling • Crop Coefficients = KC – KC = ETCrop / ET0 • Factors affecting KC these are what it depends on: – Species* – Location* – Plant development • Size • Leaf area – Spacing – Health • Presence of disease and or insect pests Transpiration ET-based Irrigation Scheduling • Crop Coefficients = KC – KC = ETCrop / ET0 • Factors affecting KC – Species – Location – Plant development • Size • Leaf area – Spacing* – Health • Presence of disease and or insect pests Transpiration Water Stress Water Stress • Ef...
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