12PS4+-+key

6 cm 2 18 cm based on the et 18 cm 09 cm day 2 days

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Unformatted text preview: / 2 = 1.8 cm Based on the ET: 1.8 cm / 0.9 cm /day = 2 days You need to irrigate every 2 days. Use the following soil moisture release curve to answer the following questions. a. What is the total porosity of this soil? 45% Pv% at saturation (ψm = 0 bars) b. What is the micropore porosity% (capillary water)? 30% Pv% at field capacity (ψm = -1/3 bars) c. What is the macropore porosity% (noncapillary water)? 15% = Total porosity - microporosity d. How many cm of water are held in 100 cm of this soil at permanent wilting point? 5 cm Pv% at PWP (ψm = -15 bars) = 5% e. How many cm of plant-available water are found in 100 cm of this soil? 25 cm PAW = Field capacity – PWP = (30% - 5%)/100 * 100 cm 50 Volumetric water content (%) 3. 40 30 20 10 0 0 -5 -10 Soil water potential (bars) -15 -20...
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