WEATHER IN CRANBERRY CULTURE 19 



flooding period is shown clearly by the lower yield from vines outside but near 

 the cylinders, and particularly from those inside, as compared with yields from 

 vines of the same variety on slightly higher ground and consequently more shal- 

 lowly flooded. 



Table 2. Comparison of Flowers and Fruit on Vines Inside the 

 Cylinders With Those Outside. 



Flowers Flower Flowers Calculated 

 Variety and per Buds Maturing Yield Cup- 

 Location Upright^ Dead Fruit Barrels count 

 Average Percent Percent per Acre 



Early Black 



Inside cylinder 3.1 12.6 21.6 28 158 



Outside cylinder, low ground^ 3.5 12.9 28.0 55 118 



Outside cylinder, high ground^ .. . 4.0 5.2 28.3 75 110 



Howes 



Inside cylinder 3.1 16.8 33.3 50 115 



Outside cylinder, low ground 3.5 17.6 34.9 72 105 



Outside cylinder, high ground 3.7 4.8 49.4 110 100 



McFarlin 



Inside cylinder 3.9 16.1 20.9 39 94 



Outside cylinder, low ground. ... . 4.0 12.9 23.5 94 



Outside cylinder, high ground 4.0 10.0 30.0 81 84 



^Area immediately surrounding cylinders. 



^On ground 4 to 5 inches higher and about 25 to 30 feet distant from the cylinder for McFarlin; 

 50 to 60 feet distant for Early Black; and 160 to 175 feet distant for Howes. 



"^This includes not only flowers that reached the blossom stage but also those killed at any stage 

 of their development. 



The yields from vines of all three varieties on higher ground were larger either 

 because the shallow water had a higher oxygen content or because the vines 

 were frozen into the ice part of the time. Unfortunately the dissolved oxygen 

 content of the water on the higher ground was not determined; but it has been 

 found repeatedly that the oxygen content is less in deep water than in shallow, 

 even a few inches making a significant difference, particularly when there is ice 

 over the bog. 



Vines of the Howes variety on high ground were on one of the highest parts 

 of the bog, the ground there being about 6 inches higher than that on which 

 cylinders 2 and 3 were placed. The water was 15 to 16 inches deep near these 

 cylinders on February 4 when the oxygen content of the water outside the 

 cylinders was lowest; therefore, only 9 to 10 inches deep on the higher ground. 

 Since the ice at that time was 7 to 8 inches thick, the vines on the higher ground 

 must have been frozen into the ice and therefore, for reasons before stated (p. 12), 

 were not injured. Vines of the McFarlin and Early Black varieties may have 

 been frozen into the ice at the same time, but this is less certain since the high 

 ground on which vines of these varieties were located was probably not more 

 than 4 inches higher than that near cylinders 2 and 3. 



The yield from vines just outside the cylinders was much less than that from 

 vines of the same varieties on higher ground. Since, for two of the varieties, 

 there was only one period during the winter when the oxygen content of the water 

 was as low as 2 cc. per liter (3 p.p.m.), and then probably for net more than three 

 to five days (Fig. 4), the reduction in yield must have been the result of the 

 low oxygen content of the water at that time. This indicates that if the dissolved 

 oxygen content of the water falls to 2 cc. per liter even for a few days the yield 



