46 



Potash, on the other hand, appears to have been always and every- 

 where greatly beneficial. Whether used alone or in any combination 

 it invariably caused a large increase in crop and its use was always 

 exceedingly profitable. 



The lesson of this experiment is plain. For our soil, potash should, 

 for the present, be the most prominent ingredient of every fertilizer 

 used. 



Lime appears lo have caused a profitable increase in crop ; but the 

 gain is small and perhaps* rather apparently than actually due to 

 lime, for the product of plot 5 was compared with that of plot 3 which 

 was the poorest nothing on the field. 



The manure caused a large increase in crops, and allowing for 

 unexhausted residue, its use proved profitable. 



GENERAL SUMMARY. 



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

 average increase of crop varying from 1.0 bushels of hard corn per 

 acre in Marblehead to 22.8 bushels in Amherst ; and from 150 pounds 

 of stover per acre in Worcester to 1420 pounds in Amherst. It has 

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

 corn than either nitrogen or pliosphoric acid in four out of the eight 

 experiments, viz. : Amherst, Shelburne, Hadley and Worcester, and 

 in another it stands on an equality with nitrogen in this respect, viz. : 

 Yarmouth. It has proved most effective in its effect upon the pro- 

 duction of stover in four experiments, viz. : Amherst, Shelburne, 

 Marblehead and Hadley. 



Results of the Use of Phosphoric Acid: This ingi-edient has proved 

 most effective in its average influence upon the production of hard 

 corn in two experiments, viz. : Freetown and Westfield, and it has 

 proved quite beneficial in two more, viz. : Shelburne and Yarmouth. 

 In its average influence upon stover, it has proved most beneficial in 

 one experiment, Freetown. Its average effocts upon production of 

 hard corn and stover vary respectively from a decrease of 2.7 bushels 

 per acre in Marblehead to an increase of 8.2 bushels in Freetown for 

 the former, and from a decrease of 187 pounds per acre in Marble- 

 head to an increase of 462 pounds in Shelburne for the latter. 



Results of the Use of Nitrogen : This element has in one case 

 proved most beneficial in its average effect upon the production of 

 hard corn, viz. : Marblehead. In one, it stands on an equality with 

 potash, viz. : Yarmouth, and in three more it has proved quite bene- 

 ficial in its average effect, viz : Freetown, Worcester and Shelburne. 



