58 



GENERAL SUMMARY. 



Results of the Use of Potash: This ingredient has produced an 

 average increase of crop varying from .6 bushels of hard corn per 

 acre in Marblehead to 48.1 bushels in Hadley ; and from 275 pounds 

 of stover per acre in Freetown to 3958 pounds in Hadley. It has 

 proved more useful in its average effect upon the production of hard 

 corn than either nitrogen or phosphoric acid in nine out of fourteen 

 experiments, viz: New Lenox, Hadley, Worcester, Yarmouth, Con- 

 cord, Bridgewater, Sunderland (north half), and Amherst (two ex- 

 periments). It surpasses nitrogen in yield of hard corn in Shelburne 

 and it exceeds phosphoric acid in this respect in Marblehead and 

 Sunderland (south half). It has proved most powerful in its effects 

 upon the production of stover in twelve experiments, viz : Marble- 

 head, New Lenox, Shelburne, Hadley, Worcester, Yarmouth, Free- 

 town, Concord, Bridgewater, Sunderland (north half), and Amherst 

 (two experiments). It exceeds nitrogen in this respect in Westfield 

 and similarly exceeds phosphoric acid in Sunderland (south half). 



Results oj the Use of Phosphoric Acid: This ingredient has proved 

 most effective in its average influence on the production of hard corn 

 in two experiments, viz : Shelburne and Westfield, and in one it has 

 excelled potash, viz : Freetown. It has proved quite beneficial in 

 four more, viz: Worcester, Sunderland (north half), Amherst (two 

 experiments) . In its average influence upon production of stover it 

 has proved most beneficial in but one experiment, viz: Westfield. 

 It excels nitrogen in this respect in Marblehead, Yarmouth, Bridge- 

 water and Amherst (south acre). Its average apparent effects upon 

 the production of hard corn and stover vary respectively from a de- 

 crease of 4.1 bushels per acre in Yarmouth to an increase of 14.7 

 bushels in Westfield for the former ; and from a decrease of 947 

 pounds per acre in New Lenox to an increase of 590 pounds in West- 

 field for the latter. 



Results of the Use of Nitrogen : This element has in three cases 

 proved most beneficial in its average effect upon the production of 

 hard corn, viz : Marblehead, Freetown, and Sunderland (south half). 

 It has surpassed phosphoric acid in this respect in New Lenox, 

 Hadley, Yarmouth, and Concord and is ahead of potash in Westfield. 

 In its average effect upon the production of stover it stands first in 

 Sunderland (south half) ; and it excels phosphoric acid in this respect 

 in eight experiments, viz : New Lenox, Shelburne, Hadley, Wor- 



