Question

BRAE 340 How many gallons of water does it take to produce a 106 pound bale of alfalfa if a 115 acre center pivot requires 72 inches of water per year and produces 10.8 tons per acre per year?

Answer 1

≅
`1.206*10^(-5)` gallons of water per year

Explanation:

knowing that 1 gal = 231 in3 and 1 Ton = 2204.62 pound, then

10.8 Ton alfalfa*115 acre/1 acre = 1242 Ton alfalfa, for this are required 72 in3, so 72 in3*1 gal / 231 in3 ≅0.31168 gal, if 1242 Ton alfalfa * 2204.62 pound/1 Ton alfalfa = 2738038 pound then 106 pound alfalfa * 0.31168 gal / 2738138 pound ≅
`1.206*10^(-5)` gallons of water per year