. Climate and plant growth in certain vegetative associations. Growth (Plants); Crops and climate; Plant ecology. 30 BULLETIN 700, U. S. DEPARTMENT OF AGRICULTURE. The smallest number of heat units above 40° F. and the largest number below 40° F., as shown in figure 4, occur in June and Sep- tember, near the beginning and ending of growth in the two lower types One of the most significant facts brought out in Table 9 is the absence of temperatures below 40° F. for August, i jj 19/5 1916 RABBIT BRUSH 1916 OAH-BRUSH * 1915 1916 ASPEN-FIR 1 I 1 (OCT NOi/. DEC. (JAN. FEB. MAR APR
. Climate and plant growth in certain vegetative associations. Growth (Plants); Crops and climate; Plant ecology. 30 BULLETIN 700, U. S. DEPARTMENT OF AGRICULTURE. The smallest number of heat units above 40° F. and the largest number below 40° F., as shown in figure 4, occur in June and Sep- tember, near the beginning and ending of growth in the two lower types One of the most significant facts brought out in Table 9 is the absence of temperatures below 40° F. for August, i jj 19/5 1916 RABBIT BRUSH 1916 OAH-BRUSH * 1915 1916 ASPEN-FIR 1 I 1 (OCT NOi/. DEC. (JAN. FEB. MAR APR MAY J UN JUL AUG. .SEP 1915 1916 5PRUCE-FIR MONTHLY AND. ANNUAL PRECIPITATION. RABBIT BRUSH OAK-BRUSH ASPEN-FIR SPRUCE-FIR MONTHLY PRECIPITATION DURING GROWING SEASON 1916 Fig. 14.—Precipitation record, 1915-1916. in the oak-brush type. All types considered, July and August are the most favorable months for growth, in so far as it is determined by temperature. 1 Growth begins in the oak-brush type approximately June 1. In the aspen-fir type the leaves begin to unfold about two weeks later. In the spruce-fir type growth begins between 3 and 4 weeks later than in the oak-brush 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 Sampson, Arthur W. (Arthur William), 1884-1967. Washington, D. C. : U. S. Dept. of Agriculture
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