STORAGE 



339 



A variety may differ in its keeping qualities when grown in dif- 

 ferent parts of the country. It may vary when grown in the same 

 locality under different cultural conditions. The character of the 

 soil, the age of the trees, weather conditions, and the care of the 

 orchard are factors modifying the growth of tree and fruit, and 

 may affect the keeping quality of apples. 



Frost-proof building for apple storage. Frost-proof construction 

 for the storage of apples generally comprises a building wholly or 

 partially below ground, with insulated side walls and ceiling. It 



Fig. 151. A fine type of concrete storehouse 



Adapted to the farm or organization of farmers. By properly ventilating and arranging for 



the taking in of cold air during the night and the release of warmer air, apples may be very 



successfully stored during the fall and winter 



is sometimes built entirely aboveground, but in this case some 

 means of heating may be necessary during extreme periods of 

 cold weather. For insulation the old-style construction consisting 

 of air spaces should be abandoned and the modern construction 

 of filled spaces substituted. Mill or planer shavings, perfectly dry 

 sawdust, cut straw, or any similar material may be used for filling. 

 Whatever is used must be protected, both on its interior surface 

 toward the storage room and on the exterior surface toward the 

 outer air, by water-tight, air-tight insulating paper. The thickness 

 of insulation desirable depends on the type of construction, the 



