138 MASS. EXPERIMENT STATION BULLETIN 192. 



Table 19. — Effect of Fertilizers on Cranberry Yield. 



The potash salts were omitted in 1918. 



Weatheb Observations. 



Weather observations and records were made in both 1917 and 1918 

 as previously, daily reports being telegraphed to the Boston office of the 

 Weather Bureau in the spring and fall, and special frost predictions being 

 telephoned to growers when asked for. 



Severe winterkilling occurred in 191&-17 on exposed bogs, the injury 

 being more extensive than in any year since 1906. The damage came 

 much earlier in the winter than usual. Many bogs winter flowed the first 

 days in February and some flooded late in January were badly hurt. 

 The winterkilling seemed a slow process. It probably took several days 

 and perhaps a week or two to complete it, as tjje weather and bog condi- 

 tions were so long the same. Unprotected bogs were frozen deeper than 



