. A laboratory course in plant physiology. Plant physiology; Plant ecology. Fig. 57.—Saucer germinator; Xi- Made of four porous saucers, as explained in text. of a cleaned, soaked, and preferably sterilized, flower-pot porous saucer holding the seeds (which are previously soaked), and covered by another of the same sort. This is placed inside a larger covered saucer which is supplied daily with water to a depth somewhat greater than the thickness of the bottom of the seed saucer. Thus the seeds are supplied with a suf- ficiency of water which is filtered by the saucer. The air should be renewe
. A laboratory course in plant physiology. Plant physiology; Plant ecology. Fig. 57.—Saucer germinator; Xi- Made of four porous saucers, as explained in text. of a cleaned, soaked, and preferably sterilized, flower-pot porous saucer holding the seeds (which are previously soaked), and covered by another of the same sort. This is placed inside a larger covered saucer which is supplied daily with water to a depth somewhat greater than the thickness of the bottom of the seed saucer. Thus the seeds are supplied with a suf- ficiency of water which is filtered by the saucer. The air should be renewed daily by lifting the covers for a moment, and blowing out the old air. This forms for most purposes an ideal germinator, fully as good as a Zurich or other specially constructed germinator. It has, however, for some pur- poses the drawback that the roots do not grow straight, nor is it useful where a considerable growth of stem also is needed. For this, and for growing seed- lings generally, the very best arrangement is a flower-pot or box filled with sphagnum moss, moderately packed; this material forms the best-known medium for the purpose, as it combines almost ideal aeration and moisture, and has little tendency to develop mould. Even the little moulding it does develop can be prevented by occasional sterilization with steam, and _t is advantageous to have in the laboratory a jar of sterilized moss, with another jar for that which has been used. The moss is so efficient that it is worth while to take some trouble to obtain it; it is sold by all dealers in gardeners' supplies, and may be used repeatedly. Next in value is sawdust, of which that made from pine, and hence free from tannin, is said to be best. In general the best depth to plant seeds is about three times their own (least) diameter, and they grow a little faster if the radicle end is pointed down-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for r
Size: 1518px × 1645px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkhholtandco
