. Cranberries; : the national cranberry magazine. Cranberries. fats into carbon dioxide and water. The process requires oxygen, which normally is obtained from the air outside the plant, and carbon diox- ide is given off. Photosynthesis occurs only in plants or parts of plants that con- tain the green coloring matter known as chlorophyll and only when they are exposed to light. It is the process by which sugars and. starch are formed. Carbon dioxide and water are used in the process and oxygen is given off. The sugars and starch thus formed are used subsequently in respira- tion to supply enei
. Cranberries; : the national cranberry magazine. Cranberries. fats into carbon dioxide and water. The process requires oxygen, which normally is obtained from the air outside the plant, and carbon diox- ide is given off. Photosynthesis occurs only in plants or parts of plants that con- tain the green coloring matter known as chlorophyll and only when they are exposed to light. It is the process by which sugars and. starch are formed. Carbon dioxide and water are used in the process and oxygen is given off. The sugars and starch thus formed are used subsequently in respira- tion to supply enei-gy to the plants. The oxygen used in respiration by the cranberry vines and other plants on a ilooded bog is taken from that in solution in the water and the oxygen given off in photo- synthesis goes into solution in it. Consequently, respiration reduces the amount of dissolved oxygen and photosynthesis increases it. How- er, when a bog is not covered with ice, changes in the oxygen content of the water as a result of these processes are usually relatively small and of short duration since there is nearly always enough wind to cause circulation of the water and thus keep it at or near its oxygen saturation . capacity. But when the bog is covered by ice, circulation by the wind is pre- vented and the amount of dissolved oxygen in the water surrounding the vines is determined by the amount of oxygen used in respira- tion as compared with that given off in photosynthesis in cranberry vines and other plants usually present. Also, bacteria or other micro-organisms which are always present where there is organic matter act to reduce the oxygen content since they use oxygen in respiration, but do not carry on photosynthesis. Under conditions unfavorable for photosynthesis, the dissolved oxy- gen content of the water is reduced more rapidly on bogs on which there is a great amount of organic matter. Less organic matter comes in cirect contact with the water on sanded, bogs than on tho
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