An introduction to agriculture . Universihj of Illinois Circtilar 168LAND TREATED WITH MAN^rRE, LIMESTONE AND A PHOSPHATE FERTILIZER are two classes of fertilizers, the natural and the arti-ficial or commercial. Natural fertilizing productssuch as manure, weeds, and crop residues like roots,straw, stalks, and leaves, are examples of naturalfertilizers. ^Manufactured fertilizing products suchas nitrate of soda and bone meal, which are preparedand sold in the commercial market, are examples ofcommercial fertilizers. 60 AN INTRODUCTIOX TO AGRICULTURE 53. Manure.— Close at hand for every farmer is
An introduction to agriculture . Universihj of Illinois Circtilar 168LAND TREATED WITH MAN^rRE, LIMESTONE AND A PHOSPHATE FERTILIZER are two classes of fertilizers, the natural and the arti-ficial or commercial. Natural fertilizing productssuch as manure, weeds, and crop residues like roots,straw, stalks, and leaves, are examples of naturalfertilizers. ^Manufactured fertilizing products suchas nitrate of soda and bone meal, which are preparedand sold in the commercial market, are examples ofcommercial fertilizers. 60 AN INTRODUCTIOX TO AGRICULTURE 53. Manure.— Close at hand for every farmer isa most valuable source of plant food. Barnyardmanure contains all of the three essential elements ofplant food. The average composition of farm manurecompiled from many analyses is approximately as fol-lows: Water 75% and organic matter 25%. One tonof manure will contain on an average 10 lbs. of nitro-. University of Illinois Circular 168 LAXD TREATED WlTil MANURE ONLY gen, 3 lbs. of phosphonis, 8 lbs. of potassium, and about500 lbs. of organic matter. The remainder will bemostlv water. This analvsis, however, will varvgreatly according to the kind of animals from whichthe manure comes, the amount and kind of beddingused, the feed fed to the animals, and the manner inwhich the manure has been kept. Much of the valueis often wasted by the slipshod way in which many SOIL FERTILITY 61 farmers take care of the manure. Manure which hasbeen fired or been exposed to rain has lost much ofits raw food materials. To preserve its full value,manure should be kept moist and compact, or else itshould immediately be spread upon the land. Value of Manure.— If the same amounts of rawplant food which are found in a ton of average farmmanure were purchased in the form of commercialfertilizers, they would cost between two and three dol-lars. The organic matter which manure adds to asoil also has a lit
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