. Productive agriculture . tains about i per cent of nitrogen and ii per centof phosphorus. Potassium Fertilizers. — The four forms of potassium fer-tilizers most commonly used are potassium chloride, potassiumsulphate, kainite, and wood ashes. Kainite is a potassiumfertihzer mined in Stassfurt, Germany, and is used in the manu-facture of most of the potassium fertilizers. The supply ofkainite at these mines is said to be inexhaustible. Potassium 322 PRODUCTIVE AGRICULTURE chloride is a manufactured product, and contains about 45 to50 per cent of potassium. Potassium sulphate is made fromkaini
. Productive agriculture . tains about i per cent of nitrogen and ii per centof phosphorus. Potassium Fertilizers. — The four forms of potassium fer-tilizers most commonly used are potassium chloride, potassiumsulphate, kainite, and wood ashes. Kainite is a potassiumfertihzer mined in Stassfurt, Germany, and is used in the manu-facture of most of the potassium fertilizers. The supply ofkainite at these mines is said to be inexhaustible. Potassium 322 PRODUCTIVE AGRICULTURE chloride is a manufactured product, and contains about 45 to50 per cent of potassium. Potassium sulphate is made fromkainite, and contains about 45 per cent of potassium. Thisform of potassium fertilizer is used for fertilizing ashes contain from 2 to 8 per cent of potash, which is very-soluble and leaches away easily. Wood ashes make a valuablefertilizer and should be carefully saved. (See Exercise 2.) Value of Commercial Fertilizers. — The value of a fertilizerdepends upon its nitrogen or ammonia, phosphorus, and available. Cottrtesv National Fertilizer ?iisoctatwn Chicago, Fig. 148. — Analysis of potato crop on farm near Tripoli, Wis. Unfertilized acre yield = 3go bu. analyzing 330 bu. marketable, 60 bu. acre yield = 470 bu. analyzing 432 bu. marketable, 38 bu. unmarketable. potash content. All other materials in a fertilizer are worthlittle or nothing and are known as filler. In order to mis-lead purchasers of fertilizers, meaningless statements are put onfertilizer bags. The following is such an illustration : Guaranteed Analysis (Found on Bags) per Cent Nitrogen .... .82 to i Equivalent to ammonia i to 2 Available phosphoric acid . 8 to 10 Equivalent to available bone phosphate 18 to 22 Total phosphoric acid .... 9 to 12 Equivalent to bone phosphate . 25 to 30 Potash actual . . 2 to 3 Equivalent lo sulphate of potash . ... .... 3-5 to s COMMERCIAL FERTILIZERS 323 All of the above and more statements may be found on bagscontaining fertilizers. When
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