Soils and fertilizers . but even on similar soils itwill vary with different manures. The following table givesthe results of an experiment in which treated and untreatedmanures were evaluated commercially and were then appUedto the land. The value of the increased crops in a threeyears rotation was then calculated in terms of financialreturn to the ton of manure appUed : Table 49. ? commekciaii and agricultural evaluation op Manures Manubb Commercial AORICCLTUEAL Value Value Yard manure untreated .... $ $ Yard manure plus floats .... Yard manure plus acid phosphate . 3.
Soils and fertilizers . but even on similar soils itwill vary with different manures. The following table givesthe results of an experiment in which treated and untreatedmanures were evaluated commercially and were then appUedto the land. The value of the increased crops in a threeyears rotation was then calculated in terms of financialreturn to the ton of manure appUed : Table 49. ? commekciaii and agricultural evaluation op Manures Manubb Commercial AORICCLTUEAL Value Value Yard manure untreated .... $ $ Yard manure plus floats .... Yard manure plus acid phosphate . Yard manure plus kainit . . Yard manure plus gypsum . . 285. Deterioration of farm manure. — There is always aloss in the value of farm manure on standing. The waysin which this is brought about are: (1) fermentation; (2)leaching. The first of these is a natural process, commonto all farm manure on standing, and not occasioned by anyoutside agencies. The second is due to the running off of. ~- .^L— _ i—i-^ til !?? ^ fi Plate XV. Manukeb. — Farm manure is becoming relatively morescarce every year. Its protection is becoming more essential to success-ful farming. FARM MANURES 227 the liquid portion of the manure, and to the exposure of themanure to rain. 286. Fermentations of manure. — The mixture of solidand liquid excreta together with litter used as bedding con-stitutes a wonderfully favorable material for the growth ofbacteria, the number of which frequently amounts to manybilUon in a gram of manure. This is many times morethan are found in soil. It is then small wonder that fer-mentations proceed at a prodigious rate in a manure fermentations are produced both by bacteria requiringoxygen for their activity and by those that need little. Thefermentations on the outside of the heap are different fromthose on the inside, where air does not readily penetrate,but as fresh manure is thrown on the pile from day to day,most of the manure f
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