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A farmer is using well water to irrigate a corn field. The water contains 100 ppm of sulfate-sulfur. The farmer will be applying about 10 acre-inches of irrigation water during the summer. An acre-inch of water (a volume of water one acre in area, and one inch deep) is about 27,000 gallons, and a gallon of water weighs 8.33 pounds. a. How many pounds per acre of water are applied? b. How many pounds per acre of sulfur would be delivered to the corn in the irrigation water? c. An irrigated corn crop needs about 25 Ib/A of sulfur for normal growth. Do you think that the field needs additional sulfur fertilizer, considering what is in the irrigation water?
Expert Answer
Answer
a. given one gallon of water weighs = 8.33 pounds
10 acre inches of will have = 10 * 27000 gallons of water
weight of water = 10*27000*8.33 = 2249100 pounds
1 acre of land will be supplied with 224910 pounds of water
b. now we know that 1 ppm = 10-6
100ppm = 0.000833 pounds/gallon
thus 27000 gallons of water will have = 27000 * 0.000833= 22.491 pounds of sulphur per acre
c. Yes . because additional 2.5 lb/A of sulphure is required for normal growth
