EEPORT OF THE CRANBERRY SUBSTATION. 



135 



Fertilizers. 



Tables 16 and 17 show the results had with the station bog fertilizer 

 plots in 1917 and 1918, respectively. The area of each plot is 8 square 

 rods, and the variety treated, the Early Black. In 1917 the fertilizers 

 were applied on June 29 and 30, and the berries picked on September 17 

 and 19. Seven bushels were used in each of the storage tests. In 1918 

 the fertilizers were applied on June 8. Eight bushels of berries from each 

 plot were examined for rot. 



Plots 1, 5, 9, 13, 17 and 21 are all untreated checks. The meanings of 

 the symbols used in the tables are as follows: — 



= Nothing. 



N = 100 pounds nitrate of soda per acre. 



P = 400 pounds acid phosphate per acre. . 



K = 200 pounds high-grade sulfate of potash per acre. 



L = 1 ton of slaked lime per acre. 

 Kcl = 200 pounds muriate of potash per acre. 

 Nj^ = 150 pounds nitrate of soda per acre. 

 N 2 = 200 pounds nitrate of soda per acre. 

 Pji = 600 pounds acid phosphate per acre. 

 Pg = 800 pounds acid phosphate per acre. 



In combination they mean, for example, N2PK = 200 pounds of nitrate 

 of soda +400 pounds of acid phosphate +200 pounds of high-gi-ade sulfate 

 of potash per acre. 



Table 16. — Fertilizer Plots in 1917. Condition and Relative Keeping 

 Quality of the Berries. 



This plot was dressed with leaf mold in 1916. 



