. Effectiveness of orchard heaters . Unheated temperatures, adjusted for natural differences between plots o Balloon + Fixed station Temperatures at center of heated x Balloon • Fixed station 40 45 50 Air temperature °F 60 \ ^- Heating a Heating ir v' tree zone ' ^ 65 0 5 10 Heating effect, °F 15 Fig. 14. Vertical profiles of temperature and heating effect in center portion of a 15-acre heated area. This test was made on a night during which there was a moderately small inversion. [21]


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