12fi MAINE STATE COLLEGE 



Comparative Effect of Different Forms of Piiospiioric Acid. 



Included in the tables showing the results of experimental work 

 in this direction, are a set of plots that have been cultivated with- 

 out manure, a set manured with stable manure from cows, and a 

 set manured with muriate of potash and sulphate of ammonia. 

 The three sets of plots which have been furnished phosphoric acid 

 have been treated like the last named set with the addition of the 

 phosphates. 



Table A gives the yields per plot and the average yield per 

 plot for the present year. 



Table B shows the average yield per acre, the gains of the 

 manured plots over the unmanured plots, and the gain per acre of 

 the plots manured with phosphates, muriate of potash and sulphate 

 of ammonia over those manured with muriate of potash and sul- 

 phate of ammonia aloue. 



Table C gives the yields for each year and the total yield? of 

 each crop. 



