. Botanical gazette. Plants. iqiqI WEAVER &• MOGENSEN—TRANSPIRATION 409 Picea Engelmanni This battery consisted of eight 3-year-old Engelmann spruce seedhngs grown in containers 3 .5 inches in diameter by inches in depth, and in soil with available moisture ranging from to 15 .1 per cent. Although the leaves dropped off badly during late December and in January, none of the plants died. All put forth a vigorous growth of new leaves during April and May of the following spring. Three of these trees, photographed in February, are shown in fig. Fig. II.—Three 3-year-old Engelman
. Botanical gazette. Plants. iqiqI WEAVER &• MOGENSEN—TRANSPIRATION 409 Picea Engelmanni This battery consisted of eight 3-year-old Engelmann spruce seedhngs grown in containers 3 .5 inches in diameter by inches in depth, and in soil with available moisture ranging from to 15 .1 per cent. Although the leaves dropped off badly during late December and in January, none of the plants died. All put forth a vigorous growth of new leaves during April and May of the following spring. Three of these trees, photographed in February, are shown in fig. Fig. II.—Three 3-year-old Engelmann spruces, three 2-year-old white firs, and one Douglas fir, all more or less defoliated; photograph taken February 28, 1918. The leaf areas of three plants, calculated at the time the leaves had just begun to fall, were , , and sq. dm. respec- tively. These areas were determined while the leaves were still intact by counting their total number, measuring the length and average diameter of each leaf, and then calculating the area of the four sides. The graphs giving the transpiration losses are shown in fig. 9. A comparison of the water losses from these plants with those of other conifers shows a remarkable similarity. Pseudotsuga mucronata Because of high mortality among the Douglas firs during the reestablishment in pots in early summer, only three 3-year-old seedlings were available for experimental work in September, These were placed in containers 3 .5 inches in diameter by 8 inches. 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 Hanover, Ind. : J. M. Coulter
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Keywords: ., bookcollectionbiodiversity, bookcollectionnyb, booksubjectplants
