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Show PRACTICAL 80IL TREATMENT. What One Farmer Did with One Piece of Land. The proper and profltablo treatment of soli comes only by nctunl experiment. experi-ment. Mr. Frank I. Mann, n practical farmer of Iroquois county, llllnolls. gives a bit of his experience as follows: fol-lows: When ten tons per aero of mamiro shipped nt 65 cents per Ion wero np-plied np-plied to land, Increasing tho yield ten bushels of corn which Bold at 50 cents per bushel, the result Wns not very profitable. So a llttlo science was applied. ap-plied. An analysis of tho soil showed a deficiency tif phosphorus, an nmplo supply of nitrogen, n largo amount of potassium with no acidity or tho soil. Test plots on which different elements of plant food wero applied gnvo no material Increase In tho yield vfrom any treatment except whoro phosphorus phos-phorus wns applied. Tho Increase from $25 worth of nitrogen was one bushel per ncre, whllo four dollars' worth of phosphorus Increased tho ylold 17 bushels, worth $8.50, whllo the,re was left In tho soil available for futuro usi enough phosphorus from this treatment for 660 bushols of corn. Nothing was left from tho nitrogen treatment but a surplus of nltrogon which proved to bo nn Injury to tho following crop. To treat this 80acro field with 125 pounds of phosphorus per acre would require ono 40-ton car of rock phosphate phos-phate at n cost ot $320, or 5,000 tons of manuro nt n cost of $2,600, ot.60 cents per ton. lint tho nitrogen In this field had beon well kept up by a crop of clover every fourth year slnco tho land was virgin soil 25 years. Science will suggest a procedure for each field or typo ot soli according to Its Individual conditions, and not tho samo treatment for all. Sclonco would hovo applied tho manuro to another field, ono that was In need ot tho nltrogan, thereby economizing both tho manuro and tho natural supply sup-ply ot nitrogen. Sclonco gives economy In showing the amount ot treatment necessary as well as tho kind ot treatment. A field may liavo ono typo of soli containing 709 pounds of phosphorus to nn aero In tho plowed soil, and another typo Willi nearly 2,000 pounds. It will not bo economy to mako tho samo amount of treatment for both. Ono field might require ono ton of llmo to correct acidity and another require flvo tons. |