. Elementary plant physiology. Plant physiology. 84 Elementary Plant Physiology. 8i. Presence of substances in solution in the soil.âTake a few kilograms of garden soil and shake in a large flask with distilled water for several minutes. After standing for half an hour, filter into a large clean evaporating dish, and evaporate to dryness. If a residue is obtained, it will denote the presence of substances in the soil. Note the char- acter of the residue. It may be of value to evaporate a similar quantity of distilled or rain water in another dish, as a control test. 82. Corrosive action of pla
. Elementary plant physiology. Plant physiology. 84 Elementary Plant Physiology. 8i. Presence of substances in solution in the soil.âTake a few kilograms of garden soil and shake in a large flask with distilled water for several minutes. After standing for half an hour, filter into a large clean evaporating dish, and evaporate to dryness. If a residue is obtained, it will denote the presence of substances in the soil. Note the char- acter of the residue. It may be of value to evaporate a similar quantity of distilled or rain water in another dish, as a control test. 82. Corrosive action of plants on minerals.âFill a five-inch pot with clean sand to a depth of 8 cm. Now lay a small piece of polished marble or an oyster-shell on the sand, with the polished surface uppermost. Place three or four beans on the shell or marble, and cover to a depth of a few centi- meters with fine soil. Set the preparation where it may receive proper care and temperature. Two weeks later, after the beans have sprouted, and attained a height of several centi- meters, take out the marble or shell, wash completely clean with water, and dry. Now observe the glistening surface by reflected light, and note the etching of the surface in places which have been in contact with the roots. Test the acidity or alkalinity of the roots of the bean, using litmus paper. Not all plants are capable of corroding rock or lime compounds in the above manner. 83. Water cultures. â Pro- cure a number of jars with a capacity of one to two liters, and â fit them with a wooden top with a slit cut from one edge to the center. Germinate a number of peas, beans, or the seeds of Con- Fig. 57.âWooden fitting for volvulus. Make a culture solution top of water-culture jar. After ^ ,, - ,, . , . Qgtmgr_ of the followmg substances :. 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 perfec
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