Feb., 1927] PROGRESS OF AGRICULTURAL EXPERIMENTS 17 



No fertilizer 166.2 bus. 



12 tons of manure 198.4 bus. 



24 tons of manure 229 7 bus. 



In this case 12 tons of manure increased the yield 31.3 bus. over 

 "no fertilizer", and 24 tons increased it 63.5 bus. This year the selling 

 price of potatoes was $1.65 per bushel, which gave a value of $4.43 

 for each of the first 12 tons of manure used, and of $4.30 for each of 

 the last 12 tons used, with no allowance being made for residual effect 

 of the manure on succeeding crops. Obviousy, however, the value of 

 a ton of manure is dependent largely upon the selling price of the 

 crop produced. 



Effect of Nature of Seed Piece— (Faic/i Fund) 



Certified seed growers sell to some extent seconds for seed, and it 

 was thought desirable to study the behavior of ''firsts" and "seconds" 

 in respect to the per cent of degeneration diseases in the stock pro- 

 duced. The results secured by 0. Butler suggest that small seed 

 l)lanted whole produced stock somewhat freer from mosaic and leaf- 

 roll than did standard-size cut seed, as will be seen from the effect of 

 size of seed on mosaic and leaf-roll figures in Table VI. 



Table VI. 



Mosaic Leaf-roll 



D stock "firsts" 3 61% 1.11% 



D stock "seconds" 2. 11% 0.52% 



H stock "firsts" 0.00% 10 13% 



H stock "seconds" 0.00% 10. 13% 



R and J stock "firsts" 62% 3 40% 



R and J stock "seconds" 90% 2 42% 



Spraying Mustard — {State Fund) 



Ex})eriments were begun for the purpose of making a comparative 

 study of the various substances that have been used to control mus- 

 tard. Tests have been made with copper sulphate, ferrous sulphate, 

 sodium nitrate, sodium nitrate and copper sulphate, calcium chloride, 

 arsenite of soda. 



Si 



FORESTRY 



Forest Plots— {Hatch Fund) 



The usual measurements in the plantations were made and several 

 additional plots established so as to have a comi)lete series of plots in 

 pure white pine from stands ten to forty years old. In a series of 

 plots twenty years old, the experiments which Mr. O. M. Pratt of 

 Holderness has been carrying on for the last twenty years with ref- 

 erence to pruning will be checked. Mr. Pratt's work has been so 

 unique that foresters from many other states have come to see what 

 he has accomplished. 



