The Elementary Principles of Scientific Agriculture, by J.C. Buckmaster and J.J. Willis

The Elementary Principles of Scientific Agriculture, by J.C. Buckmaster and J.J. Willis

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1882 edition. Excerpt: the sun, it is equally true that, unless the land be made completely clean, the good effects of these influences will not be obtained. 98. The Four Years' Course.--A four-course rotation may be greatly varied, according to the nature of the soil and of the crops it is most profitable to grow in the particular locality. The principle upon which it depends, however, is that two corn crops shall not succeed each other, but that each corn crop shall be succeeded by a green crop. The following table shows what is carried off the land by an average crop, in each year of such a rotation, and the total constituents extracted from the soil in the four years. Table showing the amount of Inorganic Matters drawn from the soil by one course of crops on the Four-course system (in lbs. per acre). It will be seen that the green crops extract from the soil nearly double the quantity of mineral matter required by wheat and barley, and that those of inorganic substances take up nearly five times as much potash, about four times as much soda, more than eight times as much lime, three times as much magnesia, nearly three times as much sulphur, considerably more phosphoric acid, and more than six times as much chlorine. While, on the other hand, wheat and barley abstract from the soil more than eleven times as much silica as the clover and turnips. 99. Different crops, therefore, have very different manurial requirements; partly because they vary in chemical composition, and partly because they take from the soil large quantities of some constituents and small quantities of others; and this enables us roughly to classify them into (i) crops in which silica is the dominant constituent, as wheat, barley, oats, and rye; (2) crops in which potash is more

Product details

  • Paperback | 52 pages
  • 189 x 246 x 3mm | 109g
  • United States
  • English
  • black & white illustrations
  • 1236845692
  • 9781236845696