From the above table, the farmer can easily determine the manurial 

 value of the feeds given to his stock, knowing that eighty per cent of the 

 elements contained in the feed is found in the manure. 



To illustrate, a ton of corn contains 33 pounds of nitrogen, 14.2 pounds 

 of phosphoric acid and 11.4 pounds of potash. The market value of 

 the elements is eighteen to twenty cents per pound for nitrogen, six cents 

 for phosphoric acid and five cents for potash. Therefore — 



The nitrogen would be worth $5.94 



The phosphoric acid would be worth .85 



The potash would be worth .57 



Making the total value $7.36 



If the corn is fed to live-stock and the manure placed in the soil, 

 eighty percent of the fertility removed is returned. In other words, 

 the farmer has had the full feeding value of the corn and $5.89 worth of 

 fertilizer to place on his land. 



It will be seen that the value of all of the fertility permanently 

 removed by the corn is only $1.47 and .81 percent of that is nitrogen, 

 an element easily replaced by planting legumes. The above figures 

 show that only 28 cents' worth of the reserve stock of potash and phos- 

 phorous is permanently taken from the soil in one ton of corn. 



TABLE NO. 2 .. PLANT FOOD CONTAINED IN A TON OF FRESH DUNG 



