. Contributions from the New York Botanical Garden. Plants. 6 Temperatures of soil at a depth of 1 foot (30 centimeters) fro7n June, 1902, to June, 1903 (degrees centigrade). 1902. 1903. June. July. i Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. Minimum ... Variation ... 6. 0 — — ! The maximum temperature for the year, ° C. (56° F.), occurred in July, and the minimum, —3° C. (° F.), in De- cember, giving a total annual variation of
. Contributions from the New York Botanical Garden. Plants. 6 Temperatures of soil at a depth of 1 foot (30 centimeters) fro7n June, 1902, to June, 1903 (degrees centigrade). 1902. 1903. June. July. i Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar. Apr. May. Minimum ... Variation ... 6. 0 — — ! The maximum temperature for the year, ° C. (56° F.), occurred in July, and the minimum, —3° C. (° F.), in De- cember, giving a total annual variation of ° C. (° F.). When plants are cultivated in pots, in green houses, the small volume of soil around the roots responds much more rapily to changes in the temperature of the surrounding air and to the influence of streams and sprays of water than does the upper layer of soil in the open. In general the soil in the green house will show a much higher average temperature, which, with the other conditions mentioned, makes necessary special treatment on the part of the gardener. If the natural conditions of water supply by precipitation were complied with the needs of the plant would by no means be met under the altered conditions of Fig. 2.—Tracings of thermographic curves of air, and of soil at a depth of 30 centimeters (1 foot), June 9-30, 1902. The daily periodicity and the direct effect upon the soil of changes in air temperatures are illustrated. Centigrade scale. The temperature of the air is shown by the uppermost of each pair of 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 resemble the original New York Botanical Garden. New York : The Garden
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectplants, bookyear1899
