. How crops grow. A treatise on the chemical composition, structure, and life of the plant, for all students of agriculture ... Agricultural chemistry; Growth (Plants). 342 HOW CEOPS GROW. the point of their issue. Girdling a fruit - bearing branch of the vine near its junction with the older wood has the effect of greatly en- larging the grapes. It is well known that a wide wound made on the stem of a tree heals up by the formation of new wood, and commonly the growth is most rapid and abundant above the cut. From these facts it was con- cluded that sap descends in the bark, and, not being ab
. How crops grow. A treatise on the chemical composition, structure, and life of the plant, for all students of agriculture ... Agricultural chemistry; Growth (Plants). 342 HOW CEOPS GROW. the point of their issue. Girdling a fruit - bearing branch of the vine near its junction with the older wood has the effect of greatly en- larging the grapes. It is well known that a wide wound made on the stem of a tree heals up by the formation of new wood, and commonly the growth is most rapid and abundant above the cut. From these facts it was con- cluded that sap descends in the bark, and, not being able to pass below a wound, leads to the organization of new roots or wood just above it. The accompanying illustration, fig. 66, represents the base of a cut- ting from au exogenous stem (pear or currant) girdled at i> and kept for some days immersed in water to the depth indicated by the line L. The first manifestation of growth is the formation of a protuberauce at the lower edge of the bark, which is known to gardeners as a callous, C. This is an extension of the cellular tissue. From the callous shortly api^ear rootlets, Ji, which originate from the vascular tissue. Rootlets also break from the stem the callous and also above the water, if the air be moist. They appear like- wise, though in less number, below the girdled place. Nearly all the organic sub- stances (carbohydrates, al- buminoids, lignin, etc.,) that. Digitized by Microsoft®. 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 Johnson, Samuel William, 1830-1909. New York, O. Judd & company
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectagricul, bookyear1868
