20 



RESULTS OF MEASUREMENTS. 



No. 



of 



Plot. 



FERTILIZERS USED. 



Nothing, 



Nitrate of soda, 



Dissolved bone-blacli; 



Notliing, 



Muriate of Potash, 



Nitrate and bone-black, 



Nitrate and potash, 



Nothing, 



Bone-black and potash, 



Nitrate, bone-black and potash, 



Land plaster, 



Nothing, 



Barn-yard manure, 



Lime, 



Nothing, 



Average of Measurements. 



These figures indicate no considerable falling off in the plots 

 receiving fertilizer with the advance of the season. 



ANALYSIS OF MANURE USED. 



Moisture at 100° C, 72.53 per cent. 



Potassium oxide, .356 " 



Phosphoric acid, .226 " 



Nitrogen, .260 " 



Insoluble matter, 6.735 " 



The manure (32 cu. feet) used on the plot weighed 1850 pounds. 

 At this rate it would supply, per acre : nitrogen, 96.2 pounds ; phos- 

 phoric acid, 83.6 pounds, and potash, 131.7 pounds. It caused an 

 apparent increase of about 69 basliels-per acre, far greater than was 

 produced by equally good manure on land as poor in other experi- 

 ments. This very large increase may be in part due to the unex- 

 hausted residue of the manure applied to the same plot last year; 

 but we have four other experiments affording similar conditions, viz. 

 Worcester, increase about 21 bushels ; ^Vestfield, increase about 30 

 bushels; Amherst, increase about 26 bushels; and Shelburne, in- 

 crease about 9 bushels. These differences are the more inexplicable 

 in view of the fact that the manure used in Freetown last year was 

 poorer than that used in most of our experiments, while that used in 

 Shelburne was best. Under Freetown last year, I wrote the manure 

 " caused a comparatively large increase in the crop. * * * This 

 large increase from manure, perhaps, indicates a need of other ele- 

 ments of plant food than those furnished by all the fertilizers used, 



