. Cranberries; : the national cranberry magazine. Cranberries. S days) there is little danger of the development of oxygen defic- iency injury from the exclusion of sunlight. If, however, cold weath- er and/or the fall of snow tends to prolong the period of darkness beyond 5 days, the grower should seriously consider pulling the water from under the ice. Usually, ice sanding results in a very uni- form layer of sand that sifts down around the vines without burying any uprights. If it can be accom- plished without inducing a defic- iency of oxygen in the water sur- rounding the vines, little or
. Cranberries; : the national cranberry magazine. Cranberries. S days) there is little danger of the development of oxygen defic- iency injury from the exclusion of sunlight. If, however, cold weath- er and/or the fall of snow tends to prolong the period of darkness beyond 5 days, the grower should seriously consider pulling the water from under the ice. Usually, ice sanding results in a very uni- form layer of sand that sifts down around the vines without burying any uprights. If it can be accom- plished without inducing a defic- iency of oxygen in the water sur- rounding the vines, little or no damage is done to the prospective crop. 2. The Winter Flood—The first two weeks of December were ab- normally mild, a condition that might make the buds susceptible to injury from low temperatures near zero. Apart from this hazard, the Winter flood will be applied largely to prevent the Winter kill- ing of the vines. Usually, sub- Jfreezing temperatures must persist »day and night for 3 successive days to kill cranberry vines. This should be a guide for the time of flooding the bogs. It is generally considered good practice not to flood the bogs deep enough to put vines underwater. If the bog is not level it seems best to leave the highest areas partly exposed in order that the lower areas be 'flooded no deeper than necessary. The heavier crops are usually har- vested from areas covered by a relatively shallow Winter flood. All bogs whose history shows a tendency to algae or slim growth should be treated with copper sul- ihate (as recommended in the Weed Chart), as soon as ice is thick enough to support a man's weight. Caution should be used near streams or ponds containing fish. If the copper is used prompt- ly along all ditches, there is little likelihood the algae will spread over the bog proper. The length of time the Winter flood is held can influence both the size and quality of the coming rop. Generally speaking, it ap- pears best to withdraw the fiood just
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