PRODUCING MARKET MILK IN NORTHWESTERN INDIANA. 25 
then added to the nitrogen, phosphoric acid, and potash contained 
in the bedding. The amounts of these constituents thus obtained 
constituted the entire fertilizer credit the cows received. 
The composition of an average ton of manure produced by each 
herd in the winter period of each year was determined by dividing 
the fertilizing constituents it contained by the number of tons pro- 
duced. It was possible to calculate the tons of manure produced 
for 100 pounds live weight of cows by using an average of the results 
of three experiments conducted by the New York station, and one 
by the Ohio station, on the amount of manure produced by dairy 
Fig. 8. — Brown streams which flowed from the exposed manure pile wasted dollars of 
fertility purchased in the feed. 
cows. 4 It was found by averaging these experiments that approxi- 
mately 13 tons of manure were produced annually for 1,000 pounds 
live weight of cows. Our computations on tons of manure produced 
are based on this figure together with the weights of the cows on 
which records were kept. The bedding used was largely straw. 
The fertilizing constituents contained in one average ton of the 
manure and bedding from all the cows on which records were kept 
in the two winters were found to be as follows: 
Pounds. 
Nitrogen 9. S 
Commercial phosphoric acid 3.2 
Potash 10.1 
* Thorne, "Farm Manures," p. 97, 
