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. C,? r-:.:} Valley to eliminate salt buildup and their costs as of November 6, 1974, are as fo l'Iows: Drain tile - plastic (most of It is plastic today) Polyethylene has gone from 13c prior to the oil shortage to 29c per pound. They expect to pay 35C around January 1, 1975. Installing the tile costs: 30.5c per foot on 3" plowed in at 5f feet deep with a gravel envelope 4B.oC per foot on 4" trench installation at 5f feet with gravel envelope $1.00 per foot on 8" trench installation Most systems have tile on 100 foot spacings with 3- or 4-inch tile and one 1,320 foot B-inch main collector drain. 14 x 1,320 = 18,480 feet of 3- or 4- inch and 1,320 feet of 8-inch pipe. Land level in'! Two years ago this cost IBC per cubic yard. Now it costs 23c per cubic yard. One might base his analysis on some given volume of soil movement such as 8 acre feet on a 40 acre field. At 23C per cubic yard this would be $2,968 for the 40 acre field. Two years ago this would have been $2,323 per 40 acre field, .~.llu~l owi n~ This requires two 0-8 tractors and a slip plow. Present cost is $65 per hour. The present coverage is from I to 2 acres per hour depend i ng upon the soil conditions. This operation is declining in importance. One operator reports plowing of only one 30-acre block in 1974. ill tcb Ii n i nq The on-farm ditch lining costs about $9,500 for 1/2 mile of 26-28 Inch ditch with It inch concrete and 14-lnch outlets. This is up from $6,000 three years ago. The cost of this ditch would increase with different si?e valves, but this is the most common type. ~inkler Irriqation for Leachinq Sprinklers are now being more extensively utilized for leaching. Fred Jenkins is presently utilizing a seven-inch sprinkler application of water on land that is to grow sugar beets. His first crop grown on the land is rye and later sugar beets. He is presently using this method on 2,000 acres. John Elmore has found that sprinkler leaching leaves the soil more permeable and does a more complete removal of salts. It is increasingly common for lettuce 9rO~ler'3 to pre-irrigate fields with sprinklers to move the salt down ...... ct> -.1 ~ 15 "