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Home > Art, Film & Photography > Agricultural Bacteriology; A Study of the Relation of Germ Life to the Farm, with Laboratory Experiments for Students
Agricultural Bacteriology; A Study of the Relation of Germ Life to the Farm, with Laboratory Experiments for Students

Agricultural Bacteriology; A Study of the Relation of Germ Life to the Farm, with Laboratory Experiments for Students


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About the Book

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: PART II. BACTERIA IN SOIL AND WATER. CHAPTER III. NATURE'S FOOD-SUPPLY. THE CARBON CYCLE. THE CONTINUATION OF THE FOOD-SUPPLY. The farmer's primary occupation consists in converting soil, water, and air into human food. This he does through the agency of plants that grow in the soil and furnish the food necessary for his stock, in addition to a part of his own food. So long as plants find in the soil proper conditions for growth, the food-supply will not fail. The problem of keeping up the food-supply of plants thus becomes the one problem of supreme importance. By far the largest part of the plant food, in weight, comes from the air in the form of carbonic dioxid and water, and these two substances are practically inexhaustible. But, in addition, some foods are obtained from the soil. These last are present in the soil in limited quantities only, and some of them are found only in the upper layers. They are constantly being used by successive generations of plants. This constant use, in the course of centuries, would have quite exhausted the soil were there not some means by which these supplies were replaced. That there is some such means is evident from the fact that plants have continued to grow on the same soil for countless generations, the soil remaining as fertile as ever. Clearly the problem for agriculturists is to find out the factors that have kept up the fertility of virgin soil and to apply them properly to cultivated soil. In this way only can the continuedfertility of the soil be assured. While various agencies are concerned in this matter of soil fertility, the agency of microorganisms is certainly one of the largest. PLANT FOODS. The green plants live chiefly upon the following foods: Water.?This material, coming from the rains, is unlimi...


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Product Details
  • ISBN-13: 9781459022874
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 114
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1459022874
  • Publisher Date: 01 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 218 gr


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Agricultural Bacteriology; A Study of the Relation of Germ Life to the Farm, with Laboratory Experiments for Students
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