The Bulletin. 



19 



These results certainly indicate that phosphoric acid is first needed 

 by this soil. Acid phosphate alone gave an increase of over 15 

 bushels per acre. ISTitrogen alone gave an increase of only 3.57 

 bushels, but when applied in addition to phosphoric acid it gave an 

 increase of 16 bushels, nearly one bushel more than did phosphoric 

 acid over no fertilizer. Potash alone gave a smaller yield than no 

 fertilizer, very little increase when applied in addition to nitrogen 

 or phosphoric acid separately, and a decrease in addition to these 

 together. 



Plate 2.— Corn Crop on Plat 6, Blantyre Field, 1910. No Fei-tilizer applied. Yield 23.9 Bushels. 



Lime gives very fair increases either alone or in addition to a 

 complete fertilizer, the gain over no fertilizer being at the rate of 

 5.3 bushels and in addition to all three elements at the rate of 7.1 

 bushels, making an average increase of 6.2 bushels per acre. This 

 would indicate that lime could be applied at a profit to this soil. 



The average gain for each element, given in the lower section of the 

 table, has been computed from the figures in the main table. For 

 example, there are four plats, each one of which received exactly the 

 same treatment as some other plat except that nitrogen was applied 

 in addition. In each case the gain for nitrogen may be determined. 

 Plat number 3 for instance, yielded at the rate of 3.6 bushels per 

 acre more than plat number 1 ; plat 7 yielded at the rate of 16 bushels 



