. Agricultural meteorology. Meteorology, Agricultural. [from old catalog]. FROST AND FROST DAMAGE 281 however, and the conditions seem to favor a low record, the fires must be lighted while the temperature is still several de- grees above the danger point. (See Table 11 for data show- ing the critical point for many of the fruits.) Tender truck crops need to be protected from freezing temperatures also. 622. The lowest temperature just before sunrise.— Fig. 86 shows a thermograph record from May 11 to 18, 1914. It was quite warm on the 11th, the curve indicating a temper- ature of 80°. A cool
. Agricultural meteorology. Meteorology, Agricultural. [from old catalog]. FROST AND FROST DAMAGE 281 however, and the conditions seem to favor a low record, the fires must be lighted while the temperature is still several de- grees above the danger point. (See Table 11 for data show- ing the critical point for many of the fruits.) Tender truck crops need to be protected from freezing temperatures also. 622. The lowest temperature just before sunrise.— Fig. 86 shows a thermograph record from May 11 to 18, 1914. It was quite warm on the 11th, the curve indicating a temper- ature of 80°. A cool wave reached the region of the station before noon of the 12th and there was a sharp drop in tem- perature. There was little variation on the 13th, but from the 14th to 17th typical radiation conditions prevailed. The temperature rose to between 60° and 70° during the daytime. Fig. 86.—Record made by a self-recording thermometer May 11 to 18, 1914, at Delaware, Ohio. under bright sunshine, but fell nearly or quite to freezing at night with free radiation. It is under conditions like those of the 14th to 17th that frosts are likely to occur and, as shown by the record, the lowest temperature will be reached just before sunrise. 623. Protection by heating possible.—Experience has conclusively proven that the temperature can be kept above the danger point by orchard-heating when otherwise it would fall low enough to cause damage to fruit and truck. Arrangements can be made to receive frost warnings by writing the nearest Weather Bureau Office if an effort is made to protect fruit or truck from frost damage. LABORATORY EXERCISES 1. Paragraph 603. Obtain daily mean temperature and killing frost data from the local Weather Bureau and compare the frostless and vegetative Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemb
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