. Effectiveness of orchard heaters. Fruit. burning, it was ° F. The average burn- ing rate was gallons per hour, and the temperature inversion was 13° F. The average vertical temperature pro- files obtained between 3:00 and 6:00 during this run are not shown. However, they were similar in shape to the ones for the Riverside run with similar inversion (fig. 13) but with temperatures 12 to 14° F colder at all heights up to the 300- foot limit of the readings. There was no indicated heating effect above 100 feet and very little above 50 feet. Twenty-eight acre area at West Covina. Two
. Effectiveness of orchard heaters. Fruit. burning, it was ° F. The average burn- ing rate was gallons per hour, and the temperature inversion was 13° F. The average vertical temperature pro- files obtained between 3:00 and 6:00 during this run are not shown. However, they were similar in shape to the ones for the Riverside run with similar inversion (fig. 13) but with temperatures 12 to 14° F colder at all heights up to the 300- foot limit of the readings. There was no indicated heating effect above 100 feet and very little above 50 feet. Twenty-eight acre area at West Covina. Two runs were made in an iso- lated orange orchard near West Covina on nights when light or moderate general firing was required. The terrain at this location is very flat, since the orchard is located on the floor of a valley. Even so, the average 20-foot wind velocity during the two nights was 1 to 1% miles per hour. Since there was no adjacent or- chard, it was necessary to locate the un- heated check station in a bare, plowed field. In addition to the regular heater spac- ing of one per 2 trees within the orchard, . i5o s > T? there was a border row along the north- east side with one heater per tree. The southwest border had a few extra heaters, but the other two had only the regular spacing. On the night of January 2-3, 1942, all of the border heaters and every fourth row within the plot were burned from 1:30 to 8:00 During the night of February 14-15, the first heaters were lighted at about 1:00 , following the same pattern as for January 3. Addi- tional heaters were lighted at 4:00 and still more at 6:30 , as indicated in the upper part of figure 17. After 6:30 , all of the odd-numbered rows of heaters within the orchard were burning, in addition to the borders. For both nights the average heater burning rate was about gallons per hour. The average inversion was 8° F on the first night and ° F on the second night. Vertical
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