. Agriculture for southern schools. problems for the usual lesson inarithmetic. Additional Problems : — (i) What is the commercial value of a ton of complete fertilizer con-taining 8 % available phosphoric acid, 3 % nitrogen, and 3 % potash ? (2) How much nitrate of soda, kainit, and 16% phosphate containthe same amounts and kinds of plant-food as the ton of the fertihzerjust mentioned? (3) What would this mixture cost with acid phosphate at $15,nitrate of soda at $55, and kainit at $14 per ton? (4) How much 16% phosphate, cotton-seed meal, and muriate ofpotash would afford the same number of
. Agriculture for southern schools. problems for the usual lesson inarithmetic. Additional Problems : — (i) What is the commercial value of a ton of complete fertilizer con-taining 8 % available phosphoric acid, 3 % nitrogen, and 3 % potash ? (2) How much nitrate of soda, kainit, and 16% phosphate containthe same amounts and kinds of plant-food as the ton of the fertihzerjust mentioned? (3) What would this mixture cost with acid phosphate at $15,nitrate of soda at $55, and kainit at $14 per ton? (4) How much 16% phosphate, cotton-seed meal, and muriate ofpotash would afford the same number of pounds of each plant-food asone ton of the fertilizer mentioned in first problem ? (5) Which should a farmer buy, muriate of potash at $55 perton, or kainit at $14? What would a pound of potash cost in each? (6) Which should a farmer buy, acid phosphate containing 16%■available phosphoric acid, costing $14 per ton, or a lower grade con-taining 12%, costing $12 per ton? What does a pound of availablephosphoric acid in each cost?. Fig. 67.—Nodules on a Legume, aiding theFarmer to secure Nitrogen SECTION XIX. SUITING THE FERTILIZERSTO THE SOIL The amount of fertilizer per acre varies with the landand with the crop. Vegetables and cotton generally paybetter for large amounts of fertilizer than does corn. Forcotton, many farmers use only 200 pounds per acre. Goodfarmers often use 400 to 600 pounds. Growers of vege-tables increase this to as much as one half or one tonof commercial fertilizer per acre. As labor and landbecome scarcer or higher it pays to increase the amountof fertilizer. Some land may be too poor for verylarge amounts of fertilizer to be very profitable. This isbecause a poor soil may be so shallow or so deficientin vegetable matter that in dry weather it can hold justenough water to make good use of only 300 pounds offertilizer per acre. When this same soil is made deeperand supplied with vegetable matter, it may hold enoughmoisture to use profitably double th
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