2010%20BRAE%20236%20HW14-15

2010%20BRAE%20236%20HW14-15 - A) 0.5 in B) 1.0 in C) 1.5 in...

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BRAE 236 HW14 and 15 MAD and SMD Questions a. Clay loam soil, saturation = 4.8 in/ft, AW = 1.6 in/ft, PWP = 2.0 in/ft, air dry = 1.5 in/ft. What is FC (in/ft)? A) 3.6 in/ft B) 2.1 in/ft C) 1.6 in/ft D) 0.5 in/ft ? b. Same soil as in problem a). What is the moisture content of the soil (%) if SMD = 0.5 in/ft? A) 28.3 % B) 25.8 % C) 20.1 % D) 15.4 % B c. Clay loam soil, Saturation = 40%, FC = 28%, PWP = 16%, Air Dry = 13%. What is the SMD if the soil moisture content is 23% ? A) 2.8 in/ft B) 1.4 in/ft c) 0.9 in/ft D) 0.6 in/ft D d. Tomatoes with a 4 foot root zone are grown on a sandy loam soil. AWHC = 1.25 in/ft. ETc = 0.25 in/day, and the irrigation manager uses MAD = 60%. What is the total Available Water Holding Capacity for the root zone? A) 1.5 inches B) 2.0 inches C) 3.0 inches D) 5.0 inches D Water Penetration Questions e. How much rain (inches) will it take to penetrate 3 feet into the soil if the SMD is 0.5 in/ft?
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Unformatted text preview: A) 0.5 in B) 1.0 in C) 1.5 in D) 2.0 in C f. SMD totals 7.0 inches for a 36-inch root zone. How deep into the soil will 4.0 inches of water penetrate? A) 36 inches B) 7.0 inches C) 20.5 inches D) 4.0 inches ? Available Water Questions Problems g-i: Given: The following representative soil log for a field. Soil Texture Depth, in. Zone Thickness, ft AW, in/ft Clay Loam 0-18” 1.5 2 Loam 18-36” 1.5 1.65 Sandy Loam 36-60” 2 1.25 g. Find the total PAW of the soil root zone for a crop with an effective rooting depth of 30 inches. A) 1.75 in B) 2.69 in C) 3.33 in D) 4.65 in D h. Find the total AW of the soil root zone for a crop with an effective rooting depth of 48 inches. A) 1.75 in B) 2.69 in C) 3.33 in D) 6.73 in ? i. If RZ = 48 inches and MAD = 40%, what is the SMD just before irrigation? A) 1.75 in B) 2.69 in C) 3.33 in D) 4.65 in B...
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This note was uploaded on 11/07/2010 for the course BRAE 236 taught by Professor Styles during the Fall '08 term at Cal Poly.

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