30 MASS. EXPERIMENT STATION BULLETIN 168. 



Plots 1 5, 9, 13 17, 21, 22 and 23 are all untreated check plots. The 

 meanings of the fertilizer symbols used in the table are as follows : — 



0= 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 lime (slaked) per acre. 

 Kcl =200 pounds muriate of potash per acre. 

 Nij =150 pounds nitrate of soda per acre. 

 N2 =200 pounds nitrate of soda per acre. 

 Pi§ =600 pounds acid phosphate per acre. 

 P2 =800 pounds acid phosphate per acre. 



In combination they mean, for example, as follows: N2PK = 200 

 pounds of nitrate of soda + 400 pounds of acid phosphate + 200 pounds 

 of high-grade sulfate of potash per acre. 



The fertilizers were applied in the different years on dates as follows: 

 1911, middle of July; 1912, June 25 and 26; 1913, July 15; 1914, June 17 

 and 18 (except plot 12 and the lime on plot 11, July 17); 1915, June 26 

 and 28. The plots were all picked with scoops each year, on dates as 

 follows: 1911, September 13 and 15; 1912, September 11 and 12; 1913, 

 September 15 and 16; 1914, September 16 and 17; 1915, September 14 

 and 16. 



The berries were run through a separator before they were placed in 

 storage tests in 1912 and 1914. They were stored without separating in 

 1913 and 1915, — in the latter year as soon as they were picked. The 

 percentages of loss in storage were obtained from measurements of the 

 quantities of fruit at the beginning of the tests and after the screening 

 was done at their close in 1912, 1913 and 1914. In 1915 they were obtained 

 by averaging the results of the examinations of cup samples, taken from 

 January 3 to 7, inclusive, the results of the sampling being shown in some 

 detail in Table 3. 



The figures in the table seem to show a moderate average increase in 

 the quantity of fruit obtained during the five-year period from the fertilized 

 areas as compared with that from the checks. The figures given for 

 plot 15 are misleading, as half of that pl'ot was used in sprajang tests with 

 Bordeaux mixture, there being a considerable reduction in its quantity 

 of fruit some years as a consequence. 



The average percentages of loss in the storage tests seem to indicate that 

 the nitrate of soda impaired the keeping quality of the fruit somewhat, 

 while no effect in this respect connected with the use of acid phosphate 

 and sulfate of potash is apparent. It will be noted that the berries from 

 the plot treated with lime did not keep at all well in 1914 and 1915 as 

 compared with those from the other plots, though in the 1912 tests they 

 showed about as little decay as any. It should be stated in this con- 

 nection that a marked scattering of dead and dying vines developed on 

 all parts of this plot in the late summer and fall of 1915, no other con- 



