98 



THE CHEMISTRY OF THE FARM 



ESTIMATED LOSSES PER ACRE DURING A FOUR-COURSE 

 ROTATION BY SALE OF CORN AND MEAT.' 



The loss of potash is seen to be extremely small, and 

 may generally be quite disregarded. If, however, no 

 cake is used, and the land is poor in potash, the loss 

 might be replaced by the use of 1^ cwt. of kainite for 

 the seeds. The loss of potash will, of course, be 

 greater than we have stated if urine has run to waste 

 in the stables, or if the farmyard manure has suffered by 

 rain and drainage. 



The loss of phosphoric acid would be replaced, even 

 if no cake were employed, by the use of 2 cwts. of 

 superphosphate for the swedes. 



' It is assumed that the crops are consumed by sheep and cattle of 

 all ageSy and not simply by fattening stock. 



