The New Potatoe Culture as Developed by the Trench System, by the Judicious Use of Chemical Fertilizers, and by the Experiments Carried on at the Rural Grounds During the Past Fifteen Years

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Rural Publishing Company, 1891 - Potatoes - 165 pages
 

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Page 164 - English varieties being allowed to remain in layerage two years, but the American varieties only one (Fig. 27). Layerage plants are usually set in nursery rows for a year after removal from the stools. Green-layering during summer is sometimes practised for new or rare varieties. CHAPTER VII.— Pollination, giving directions for making crosses, etc. This book is now completed, and is on sale. Price, in library style, cloth, wide margins, $ij Pocket style, paper, narrow margins, 50 cents.
Page 164 - List. This is the great feature of the book. It has an alphabetical list of all kinds of plants, with a short statement telling which of the operations described in the first five chapters are employed in propagating them. Over 2,000 entries are made in the list. The following entries will give an idea of the^method : ACER (MAPI.E).
Page 89 - ... concerned, this worn out soil, that was so poor that it would not grow a good crop of weeds, was more deficient in available nitrogen than in any other constituent of plant-food. Superphosphate and potash, without nitrogen, did no good. They could produce no effect from lack of nitrogen. Thirtytwo pounds of nitrogen per acre, in the form of nitrate of soda, raised the crop from 74 bushels per acre (or possibly 59 bushels) to 141 bushels per acre. The same amount of nitrogen on plot 8, in 1,020...
Page 63 - States, and nearly two-thirds as much as in some important European countries. By superphosphate of lime alone, the produce is raised from an average of scarcely two, to nearly 3^ tons ; that is, to very little more than by the superphosphates alone. It is evident, therefore, that up to this amount of production, the character of the exhaustion induced by the growth of the crop on this land, which was, agriculturally speaking, in a somewhat exhausted condition, was much more that of available phosphoric...
Page 164 - Seeds, for the raising of new varieties should be sown as soon as well cured, in lo?.m or sandy soil, or they may be stratified and sown together well with the sand in the spring. Cuttings six to eight inches long, of the mature wood, inserted two-thirds their length, usually grow readily, especially if taken in August or September and stored during winter. Stronger plants are usually obtained by layers, and the English varieties are nearly always layered in this country.
Page 164 - Stocks are grown from stratified seeds, which should be sown an inch or two deep ; or some species, as A. dasycarpum, come readily if seeds are simply sown as soon as ripe. Some cultural varieties are layered, but better plants are obtained by grafting. Varieties of native species are worked upon common or native stocks. The Japanesesorts are winter-worked upon imported A.
Page 64 - ... constituents being adequately supplied, the further addition of nitrogenous manures was essential to obtain anything like full crops. It is of interest to observe that the amount of disease was not enhanced by the continuous growth of the crop on the same land, as is frequently assumed to be the case. But little is definitely known of the special function of individual mineral constituents in vegetation. It is, however, pretty clearly established that the presence of potash is essential for the...
Page 65 - ... more porous and easily permeable to the surface roots, upon the development of which the success of the crop so much depends. Then, again, something may be due to an increased temperature of the surface soil engendered by the decomposition of so large an amount of organic matter within it; whilst...
Page 138 - Henderson, commenting upon this, took the view that "further experiments will show that this increased productiveness will not continue to hold, because the reason for the greater or less yield was probably only an accident of circumstances, due to specially favorable conditions of the set made to form the hill, or to being highly fertilized, or to some such cause that gave it this temporary advantage ; and that the chances are all against any permanent improvement being made by sach selections.
Page 63 - ... cwts. per acre. The better result by nitrate of soda than by ammonium salts is doubtless due to the nitrogenous supply being more immediately available, and more rapidly distributed within the soil, and so inducing a more extended development of feeding root. These negative results by the nitrogenous manures alone, confirm the conclusion that by the continuous growth of the crop on this land, it was the available supply of mineral constituents within the root-range of the plant, more than that...

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