1 82 Diseases of Truck Crops 



an excess of moisture and not to ventilate has the same 

 result, since by shutting off all ventilation the inside 

 moisture will accumulate. Thus on days when the 

 inside air is moist, natural ventilation is insufficient. 

 Hence the many critical periods during the storage 

 season. 



How to Meet the Ventilation Problem in Storage. 

 The best means of natural ventilation is from the 

 sides, either through doors and windows or through 

 special ventilators (fig. 29 a-c). The bins should be 

 constructed with false slat -bottoms, raised from three 

 to four inches from the floor; the sides should be 

 slatted, and at least eight inches from the wall, this 

 space being connected directly with the opening to 

 the floor below. 



The ventilation between the floors must be pro- 

 vided by means of trap-doors. In small houses with 

 one row of bins on each floor, these ventilators may be 

 12 to 1 6 inch trap-doors running parallel and adjacent 

 to the side walls. In medium sized houses with two 

 rows of bins and the main aisle through the center 

 running lengthwise through the house, the bins 

 should be 12 to 1 6 inches from the wall and the trap- 

 door alongside the wall should occupy the distance 

 between the wall and the bin. In the center aisle, 

 which is usually three feet wide, this entire walk 

 could well be converted into two parallel trap-doors, 

 each i% feet wide. Large houses should have their 

 main aisle along the side walls. These should be at 

 least 3>2 feet wide. A center aisle between the two 

 rows of bins should be three feet wide. All these 



