For the measurement of the change of respiration rate caused by the gas content of storage atmosphere which furnishes important data for the interpretation of ULO storage, GC was used. It has been shown that the respiration rate and respiratory heat generation rate of Fuji apple is more than doubled in normal low temperature storage when compared with ULO storage, and that in ULO storage the respiration rate and respiratory heat generation rate directly proportional to the concentration of O2 in storage atmosphere as well as inversely proportional to that of CO2. It was possible to establish a functional formula for the respiratory heat generation rate of Fuji apple in all the storage conditions in terms of u=-0.7638+0.0003 O2-0.0007 log(CO2)+0.1369 log(Tb) concerning temperature and the concentration of O2 and CO2

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