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قراءة كتاب Asparagus, its culture for home use and for market A practical treatise on the planting, cultivation, harvesting, marketing, and preserving of asparagus, with notes on its history
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Asparagus, its culture for home use and for market A practical treatise on the planting, cultivation, harvesting, marketing, and preserving of asparagus, with notes on its history
branchlets, three to seven inches long, less than one-quarter inch thick, are mostly clustered in the axils of minute scales. The rootstock, or "crown," is perennial, and makes a new growth each year of from one to three inches, extending horizontally, and generally in a straight line. It may propagate from both ends, or from only one, but in either case the older part of root stalk becomes unproductive and finally dies. Fig. 7 shows the new portion of the rootstock crowned with buds for the production of new shoots, while the older portion bears the scars and dead scales of previous growths. From the sides and the lower part of the rootstock numerous cylindrical, fleshy roots start and extend several feet horizontally, but do not penetrate the soil deeply.
In the course of time the older roots become hollow and inactive without becoming detached from the rootstock. The young root formation always takes place a little above the old roots, which circumstance explains why the asparagus plants gradually rise above the original level, thus necessitating the annual hilling up or the covering of the crowns with additional soil.
The asparagus flowers are mostly solitary at the nodes, of greenish-yellow color, drooping or filiform, jointed peduncles; perianth, six-parted, campanulate, as seen in Fig. 8. Anthers, introrse; style, short; stigma, three-lobed; berry, red, spherical, three-celled; cells, two-seeded. While the flowers are generally diœcious—staminate and pistillate flowers being borne on different plants—there appear also hermaphrodite flowers, having both pistils and fully developed stamens in the same flower. Fig. 9 shows a pistillate, Fig. 10 a staminate, and Fig. 11 a hermaphrodite or bisexual flower.
In one case, at least, the author has also observed that a plant which has been barren of seed at first changed into a seed-bearing plant the following year. Similar changes in the sexuality of strawberries have been observed under certain conditions. These facts may explain, in a measure, the difficulty experienced in raising permanently sterile asparagus plants.
Asparagus acutifolius.—A native of Southern Europe and Northern Africa. It has a fleshy rootstock, hard, wiry, brown stems, five to seven feet high, with rigid branches three to six inches long, thickly closed, with tufts of gray-green, hair-like, rigid leaves, which in exposed situations are almost spinous. Flowers yellow, a quarter of an inch in diameter, fragrant. The young sprouts are tender, and, when cooked, of a peculiar aromatic flavor. In their native home they are used like the cultivated kind.
A. aphyllus.—Indigenous to Greece, where the young shoots are commonly used as food, especially during Lent.
III
CULTURAL VARIETIES
lthough but one species of edible asparagus has found its way into general cultivation, many varieties and strains are recognized.
Up to within a comparatively recent period it was thought that there existed only one distinct kind, or variety, of asparagus. As late as 1869 so keen an observer as Peter Henderson believed that "the asparagus of our gardens is confined to only one variety, and the so-called giant can be made gigantic or otherwise, just as we will it, and the purple top variety will become a green top whenever the composition of the soil is not of the kind to develop the purple, and vice versa. All practical gardeners know how different soils and climates change the appearance of the same variety. Seeds of cabbage taken from the same bag and sown at the same time, but planted out in soils of light sandy loam, heavy clayey loam, and peat or leaf-mold, will show such marked differences when at maturity as easily to be pronounced different sorts. This, no doubt, is the reason why the multitude of varieties of all vegetables, when planted side by side to test them, are so wonderfully reduced in number."
But after inspecting an acre of ordinary asparagus and an acre of Abraham Van Siclen's Colossal—which was afterward introduced as Conover's Colossal—at Jamaica, L. I., N. Y., Mr. Henderson wrote: "A thorough inspection of the roots of each lot proved that they were of the same age when planted. The soil was next examined, and found to be as near the same as could be, yet these two beds of asparagus showed a difference that no longer left me a shadow of a doubt of their being entirely different varieties."
In but few vegetables do the conditions of soil, locality, mode of cultivation, and other circumstances affect the quality, size, and appearance as much as in asparagus. It is therefore difficult to distinguish fixed and permanent varieties from mere local strains and forms secured by selection.
Through natural and artificial selection, through use of seed of strong shoots from superior roots, there has been improvement in the size and yield of asparagus; from the peculiar adaptability of soil and climate, and the effect of manure and high cultivation, there have appeared certain variations in the product of different beds which have led to the bestowing of a new name; but the effect of this care and these favorable conditions is not sufficiently strong to produce distinct varieties with fixed characteristics. Therefore, with correct and rational treatment of the plant from the time of seeding through all the stages of culture, satisfactory results may be reached with almost any of the varieties on the market.
AMERICAN VARIETIES
Barr's Mammoth (Barr's Philadelphia Mammoth).—Originated with Crawford Barr, a prominent market gardener of Pennsylvania. It is one of the earliest varieties, is very productive, and grows to the largest size. In Philadelphia it is much sought after, and brings the highest prices.
Conover's Colossal (Van Siclen's Colossal).—Originated with Abraham Van Siclen, of Long Island, N. Y., and was introduced by S. B. Conover, a commision merchant of West Washington Market, New York City, some thirty years ago. The superiority of this variety over all other kinds known at that time made it soon supplant all other varieties, and it is to this day better and more favorably known than any other sort.
Columbian Mammoth White.—This was introduced by D. M. Ferry & Co., in 1893. The immense shoots are clear white, and, in favorable weather, remain so until three or four inches above the surface, without earthing up or any other artificial blanching. The crown or bud of the young stalk is considerably smaller than the part just below it, thus further distinguishing the variety. All but a very few of the seedlings will produce clear white shoots, and the green ones can be readily distinguished