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Show TliufiiT.iy, March 23, Pnc6, UfaS l?7 Superphosphate vs. Concentrated Superphosphate Nitrogen Plus Phosphorus Essential For Maximum Profit on Legume Kay Grass will use large amounts but it also requires of nitrogen, The way to select a phosphate fertilizer, therefore, is in the basis of cost per pound of available Buy phosphate on the basis qf the cost per pound of available oounds of phosphorus, the yield plant food, advises Rell F. Argyle, was increased another one and Utah State University Extension a half tens above the plot where agent. growth. Superphosphate and concentrat' A balance of phosphorus must only nitrogen was applied. The the fertilizer value ed minus hay superphosphate have approxibe present in the soil if the gross cost has increased to $93.28acre. mately equal value as phosphate )s to fully utilize the nitrogen Approximateely $28 more than the fertilizers, if you take into acthat has been applied. Clover nitrogen alone plot. When higher count their vailable phosphate conand alfalfa (legume plants) are rates of nitrogen were applied tents, he said. As most farmers realize superheavy feeders of phosphorus, but they had to increase the application of phosphate accordingly phosphate contains about 20 per from own fix their they nitrogen to obtain maximum profits. 120 cent available phosphate while the air. Applying phosphorus to per acre with concentrated superphosphate conpounds of a grass legume pasture or hay 40 pounds nitrogen of phospha'e gave a tains two and times field serves a dual purpose. It yield of 5.81 tons per acre with as much. As a fertilizer, then, is concentrated superphosphate provides the phosphorus require- a profit of $109.82. By increasing the phosphorus to worth approximately two and ments' of both the grass and le80 pounds per aere, with 120 times as much as supergumes and by stimulating the of nitrogen, the yield phosphate. pounds )egume growth, these plants fix went up to 6 78 tons per According to Dr. Paul D. Chrismore nitrogen from the air and again with a profit of $127.56. acre tensen, Utah State University Exmake it available in the soil for In addition to the increased tension Services soil scientist, the grass to use. in tons of hay, the quality Farmers frequently raise quesyield On the Ivan Kerbel ranch, a of the hay was also improved. tions concerning the value of supof field fertilizer series plots were The phosphorus and protetin con- erphosphate on saline or black alinstalled on a grass legume hay tent has been increased 48 per kali soils, because the fertilizer is field (90 per cent grass, timothy, cent and 61 per cent, respectively. sometimes promoted on this basis. gmoothbrome, orchard, and 10 Both these nutrients are important Superphosphate contains approxiper cent legumes, red clover, and in the diet of livestock and will mately 50 per cent gypsum which alsike clover). One plot had only more pounds of meat per is calcium sulphate. Gypsum may yield nitrogen applied, 80 pounds of ton of feed. help to reclaim black alkali soils nitrogen per acre, and the remainder of the plots had various rates of nitrogen and phosphate applied in several combinations. Where no fertdizer was applied, Jhe yield was .97 tons per acre. With hay valued at $22 per ton, his 'gross return per acre would be $21.34. An application of 80 pounds of nitrogen per acre increased the yield to 3.39 tons. The Jiay value would be worth $74 58. After subtracting the cost of the Fertilizer, $9.60, the farmers return has increased to $64.98 per acre. By applying the same amount of nitrogen, with 40 & first, there is ro gypsum already present in the soil; second, there is not enough calcium in the irrigation water, and third, the soil can be leached after the gympsum is applied. It should be emphasized, he said, little, if any, benefit will result from applying gypsum to normal soils or to saline or white provided: alkali sells. In oth-.words, few soils in Utah require gypsum. Many of the soils in the state, including large areas in Uintah, Duchesne, Carbon, Emery, Millard and other counties, contain a lot of gypsum. Execept for a few limited situDr. Christensen said. ations, r there is no need to apply gyp- sum. Where it is needed, 5 tons or more are required on each acre. If fanner applies 500 pounds of superphosphate per acre, he will be adding only about 250 pounds Gg ton) per acre of gyp- sum. The use of superphosphate then, for the reclamation of black alkali soils, appears unwarranted. Many field fertii.zer tests in Utah indicate that it makes no difference as far as crop yields are concerned whether you apconcentrated ply superphospate, or phosphoric superphosphate, acid, so long as jou apply the same quantities of available plant food. Dr. Christensen reported. phosphate contained therein. Include your handling and spreading expenses in the cost. 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