. A golf course manager noticed that when she irrigated the fairways the water would not infiltrate very readily. Soil samples were collected, and the soil solution (saturated paste extract) contained: 1600 ppm Ca+2, 960 ppm Mg+2, and 2760 ppm Na+ (tip: express per liter to calculate). The CEC is 35 meq/100g soil and the lab recommended lowering the ESP to 5% to improve infiltration. Note an acre furrow slice (lbs/a-ft) weighs 2,000,000lbs. (Taken from Question 34 in text). a. Calculate the gypsum required to lower ESP to 5% (lbs/a-ft). b. How much S (lb/a-ft would be required to lower the ESP to 5%? c. The soil contained 0.2% lime. Was there enough lime present to supply enough Ca+2 to lower ESP to 5%?
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2. A golf course manager noticed that when she irrigated the fairways the water would not infiltrate very readily. Soil samples were collected, and the soil solution (saturated paste extract) contained: 1600 ppm Ca+2, 960 ppm Mg+2, and 2760 ppm Na+ (tip: express per liter to calculate). The CEC is 35 meq/100g soil and the lab recommended lowering the ESP to 5% to improve infiltration. Note an acre furrow slice (lbs/a-ft) weighs 2,000,000lbs. (Taken from Question 34 in text).
a. Calculate the gypsum required to lower ESP to 5% (lbs/a-ft).
b. How much S (lb/a-ft would be required to lower the ESP to 5%?
c. The soil contained 0.2% lime. Was there enough lime present to supply enough Ca+2 to lower ESP to 5%?
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