7 - 



The initial rate of COo absorption was the greatest with the high 

 calcium lime. It is the initail rate of CO2 absorption which determines 

 the scrubber size for a given sized storage and a given number of lime 

 loadings . 



Beginning in November, we obtained a lime sample at the top of the 

 bag and a representative sample of the entire bag content. The CO2 

 equivalent content at the top of the bag was higher during the early 

 stages of storage than the CO2 equivalent of the representative sample 

 (Table 2). By the end of storage, however, the CO2 equivalent content 

 at the top of the bag and throughout the bag were similar. 



Table 2: Carbon dioxide equivalent of lime in top of bags in compari- 

 son to entire bag content. 



Date 



% CO2 content in lime: 



Bags of lime placed vertically in scrubber. 



Summary 



On the basis of the above field observations and the preliminary 

 tests at the University, it appears that the following practices are 

 justified. 



1. Purchase of high calcium hydrated lime bagged in paper highly 

 permeable to CO2 to achieve the initial high rate of CO2 ab- 

 sorption and thereby minimize scrubber size. 



2. Purchase of lime according to the tentative specifications of 

 not more than 8% carbonates as CO2. 



3. Addition of not more than 1/3 pound of lime per bushel of ap- 

 ples in the storage when used as a supplement to other types 



of scrubber in order to minimize the possibility of excessively 

 low CO2 level. 



Reseach indicates that atmospheres of less than 2 per cent carbon 

 dioxide for Mcintosh may be deleterious to the fruit. The time period 



