. Soils and fertilizers . carriers contain about15 percent nitrogen, 14 percent phosphoric acid and 48 per-cent potash respectively. If a legume or grass crop is 212 SOILS AND FERTILIZERS used in the test the fertilizer should be adjusted to suit thecrop, as stated in Table 43. If grass is the most important No fertilizer Nitrate of soda 5 pounds Acid phosphate 15 pounds Nitrate of soda 5 pounds Muriate of potash 2\ pounds No fertilizer Acid phosphate 15 pounds Muriate of potash 2| pounds Nitrate of soda 5 pounds Acid phosphate 15 pounds Muriate of potash 2| pounds No fertilizer Nitrate of sod
. Soils and fertilizers . carriers contain about15 percent nitrogen, 14 percent phosphoric acid and 48 per-cent potash respectively. If a legume or grass crop is 212 SOILS AND FERTILIZERS used in the test the fertilizer should be adjusted to suit thecrop, as stated in Table 43. If grass is the most important No fertilizer Nitrate of soda 5 pounds Acid phosphate 15 pounds Nitrate of soda 5 pounds Muriate of potash 2\ pounds No fertilizer Acid phosphate 15 pounds Muriate of potash 2| pounds Nitrate of soda 5 pounds Acid phosphate 15 pounds Muriate of potash 2| pounds No fertilizer Nitrate of soda 2\ pounds Acid phosphate 1\ pounds Muriate of potash 1 pound Fig. 31. — Plan for a fertilizer experiment with small grains. Plats of land8 rods long and 1 rod wide, giving an area of 55 acre in each plat. The rateof application to the acre would therefore be twenty times the quantities givenin the diagram. crop the test should be made with special reference to it,and so with any other important crop. In any case a ro-. Plate XIII. Crop Work. — The upper figure shows a plat of timothythe left-hand side of which has been properly fertilized. The right-handside has received no fertilizer. Note the thick stand of daisies on thelatter. The lower figure illustrates the method of laying off plats for tests offertilizers. THE USE OF FERTILIZERS 213 tation should be followed and the system of fertilization shouldbe adjusted to the rotation as explained in § 271. In order that the kind and quantity of fertilizer shall be a con-trolling factor, the plats should be well drained and well tilledand should not be in need of lime, which may be ascertainedby either of the tests described in §§ 145, 146. 270. Calculation of the results. — Each test plat has, onone side of it, a plat that has not been fertilized. The non-fertilized or check plats will not all give the same yield be-cause the soil differs in various parts of the field. If thevariations in yield between check plats are n
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