File:Journal of forestry (1921) (14780078471).jpg

Identifier: journalofforestr19soci (find matches)
Title: Journal of forestry
Year: 1917 (1910s)
Authors: Society of American Foresters
Subjects: Forests and forestry Forests and forestry -- United States
Publisher: Washington : Society of American Foresters
Contributing Library: The LuEsther T Mertz Library, the New York Botanical Garden
Digitizing Sponsor: The LuEsther T Mertz Library, the New York Botanical Garden

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soilwater it is readily absorbed through the roots. Baumann says thatzinc salts can be presented to the living plant only in extreme dilution.A watery solution containing more than five milligrams of zinc sulphateto one liter of water (one part of zinc sulphate to two hundred thousandparts of water) acts injuriously upon seed plants. Recent researches in Europe show that a large part of the damagefrom fumes and dusts from manufacturing plants is done indirectlythrough the effect of the chemicals contained therein on the soil andhumus. The damage to surface-rooted vegetation like grass and gardentruck in the Naugatuck Valley, particularly in the vicinity of brassworks appears to be chiefly due to this indirect effect rather than tothe direct effect of sulphur dioxide on the foliage. The dust which escapes from the stacks is identical with that whichremains behind as flue dust only it is more finely divided. It comes torest at a greater or less distance from the plant on the soil and on
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mg cen- Fig. 1. Thinning out of the foliage of a fir (Abies) growing near a nianufatcr due to an excess of sulphur dioxide in the air. Fig. 2. Destruction of the grass at the corner of a building due to dust emitted withthe smoke from a brass mill. In this case the dust accumulated on the roof was washedby rains over this part of the lawn. Fig. .■>. Destruction of the grass at the base of a tree in Naugatuck Valley due to dustemitted with the smoke from a brass mill. In this case the dust which accumulated on thetree crown was washed by rains down the trunk. Fig. 4. Characteristic mosaic appearance of the foliage of broad-leaved species due topn excess of sulphur dioxide in the air. Photograph taken nenr a manufacturing center.(a) Kim. (b) Asli.

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