. Botany, an elementary text for schools. Botany. PROPER TEMPERATURE — ROOTS EXCRETE 149. PROPER TEMPERATURE.—The root must he u-arm in order to perform, its functions. Should the soil of fieULs or greenhouses be much colder than the air, the plant suffers. When in a warm atmosphere, or in a dry atmos- phere, plants need to absorb much water from the soil, and the roots must be warm if the root-hairs are to supply the water as rapidly as it is needed. If the roots are chilled, the plant may wilt or die. Try this with two potted plants, as radish, coleus, tomato, etc. Put one pot in a dish of i
. Botany, an elementary text for schools. Botany. PROPER TEMPERATURE — ROOTS EXCRETE 149. PROPER TEMPERATURE.—The root must he u-arm in order to perform, its functions. Should the soil of fieULs or greenhouses be much colder than the air, the plant suffers. When in a warm atmosphere, or in a dry atmos- phere, plants need to absorb much water from the soil, and the roots must be warm if the root-hairs are to supply the water as rapidly as it is needed. If the roots are chilled, the plant may wilt or die. Try this with two potted plants, as radish, coleus, tomato, etc. Put one pot in a dish of ice water, and the other in a dish of warm water, and keep them in a warm room. In a short time notice how stiff and vigorous is the one whose roots are warm, whereas the other may show signs of wilting. 150. ROOTS EXCRETE. — The plant not only absorbs what is already solu- l)le, but it is capable of rendering soluble small quantities of the insoluble substances present in the soil, and irJiirli may be needed for plant-food. Tin- plant accomplishes this result l>y means of certain acid excretions from the roots. These acids may even etch iiiail»lc. On a polished marble block, l)la(;e a half-inch of sawdust or soil, in which plant seeds. After the jdaiits have attained a few leaves, turn the mass of sawdust over and observe the prints of tlie roots on the niaiMe. These prints will ])e vctn- faint. An illustfatioii of this expcrimciil is ^'ivm on \y.\\x^' ~'\. Carc- fuil> |im11 \\\\ a young seedling whidi is gi-owing in soft soil, and noticr liow tenaciously tin- soil part ides arc hrld to the i-oot (Fig. 110).. 11(1. The rootIfts 1111(1 root- liairs i-Uik; to tlio i)artiili'S ol' 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 Bailey, L. H. (Liberty Hyde), 1858-1954. New York Macmillan
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Keywords: ., bookauthorbai, bookcentury1900, bookdecade1900, booksubjectbotany
