90 



Loss of horse manure bi/ exposure. 



The total lo.s3 was considerably more thau in the previous year (42 per cent in 1889 

 and G'2 per cent in 18')0), but, as in 1S8D, the greatest loss fell on the potash. 



The greater percentage of loss in this experiment is probably dne to a greater 

 degree of firefanging caused by the larger proportion of straw n.sed for bedding. 



(2) Five tons of cow mauure (9,278 pouuds excrement, 422 pounds 

 wheat straw, and 300 ])ounds piaster) were exposed from March 20 to 

 September 22 iu a loose i)ile in the same manner as the liorse nmnure. 

 From the analyses of the manure before and after exposure the total 

 amounts of the various fertilizinjj ingredients contained in the 5 tons 

 of manure before and after exposure are calculated as follows: 



Los8 of cow manure by exposure. 



Toj-1. Nitrogen. P\°fP»-'» Potash. '^""J"?-""' 



weight. 



Fre«h cow niannro 



Tlie same after exposure. 



Pound*. 

 10,000 

 5,125 



Pound*. 

 47 

 28 



Pound*. 

 32 

 2C 



Pound*. 

 48 

 44 



$11.45 

 8.00 



It will thus 1)6 seen that the total waste in the cow manure was scarcely half 

 wiiat it was in the horse manure. The fermentation of the cow manure was not 

 snllifient to oau.se any lirefaiiging at all. It is wortliy of note that in this experi- 

 ment the lo.ss of potash was very slight in comparison with that of the phosphoric 

 acitl and nitrogen; in all of our other experiments the lieaviest loss has been on the 

 potash. 



*The author summarizes the losses of manure by leaching and fermen- 

 tation as shown bv the results in 1880 and 1800, as follows: 



Original 



value per 



ton. 



LosH per 

 tun. 



Horse manure in loose pile (1889) 



liorse nianiiro iu loosi- pile (1X90) 



(Jow manure in loo.so pile (1890) 



Mixed Mianuro thoroughly compacted (1889) 



f2. 4S I 

 2.8(1 

 2.29 

 2.38 



$1.03 

 1.74 

 0.69 

 0.22 



Amount of manure produced. — The amount an«l value of the manuro 

 voided daily by cows, horses, sheei), and swine are given. While the 

 composition of manure depends very largely upon the kinds of food 

 eaten, an approximate idea of the value of the manure Irom liberal 

 feeding may be gained from the following summary: 



