. Agriculture for southern schools. to use as a fertilizer for his crop can make two profits byfirst feeding it and then using the manure as fertilizer. Any pasture or field can bemade rich by keeping on itlive-stock that is fed partly onpurchased food or food grownon other parts of the manure from differentanimals is different in fertiliz-ing value largely becausethey are fed on differentfoods. Manure from thepoultry house is several timesmore valuable than any only the solid wastefrom animals is saved, thefarmer gets only about halfthe fertilizer available. Ifthe manure p
. Agriculture for southern schools. to use as a fertilizer for his crop can make two profits byfirst feeding it and then using the manure as fertilizer. Any pasture or field can bemade rich by keeping on itlive-stock that is fed partly onpurchased food or food grownon other parts of the manure from differentanimals is different in fertiliz-ing value largely becausethey are fed on differentfoods. Manure from thepoultry house is several timesmore valuable than any only the solid wastefrom animals is saved, thefarmer gets only about halfthe fertilizer available. Ifthe manure pile has no roofover it, the rain water de-stroys much of the fertilizing value. Manure that has beenexposed to rain for a number of months is sometimes worthless than half as much for fertilizing crops as it was atfirst. Most of the plant-food has been dissolved andcarried off by water; some of the nitrogen has changedinto ammonia and passed off into the air as a strong-smell-ing gas; and a large part of the soil-loosening material. Fig. 6o. — Showing fiksx how mostOF THE Value of Manure is Lost, AND SECOND, HOW MOST OF IIS VALUE IS Retained BARNYARD MANURE 95 has disappeared or been slowly burned, for rotting is akind of slow burning. A roof over the manure pile pre-vents the great loss caused by water, but the other lossesgo on even with the roof. The best plan, therefore, is toput manure into the ground as soon as possible and beforeany waste has occurred. Composts. — Compost heaps are piles of manure mixedwith other materials, such as leaves or cotton seed, withsometimes phosphate added. Partial rotting makes themanure less coarse and makes it act more quickly on thecrop. The same materials can be mixed in the furrow inthe field. When they rot there, the soil prevents , when organic matter rots in the soil, it causesthe soil touching it to rot too, that is, to change someof its compounds into substances that plants can use asfood. It is generally best to pl
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