The Principles of Agronomy; A Text-Book of Crop Production for High-Schools and Short-Courses in Agricultural Colleges
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The Principles of Agronomy; A Text-Book of Crop Production for High-Schools and Short-Courses in Agricultural Colleges

The Principles of Agronomy; A Text-Book of Crop Production for High-Schools and Short-Courses in Agricultural Colleges


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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: CHAPTER III PLANT STRUCTURE Just as a locomotive engineer needs to know the parts and arrangement of his engine to keep it working smoothly, so the farmer must understand the mechanism and function of plants in order to remove obstacles in the way of their best development. Plant structure determines in a large measure plant functions, and economic production depends on the unobstructed activity of life processes. Therefore, a clear understanding of the kind and location of activity that goes on within the plant will enable the farmer to handle his crop more satisfactorily. This is particularly true under abnormal conditions such as plant diseases, the nature and location of which must be understood for effective control. 18. Cells (Fig. 4). ? Roots, stems, leaves, bark, and flowers are so readily distinguished that everybody knows about them. Rings in wood, rind of melons, bran of wheat, and pith of corn are likewise matters of common observation. Neither pores in the skin of animals nor openings in the leaves of plants can be seen with the unaided eye, yet every wide-awake schoolboy knows of them. Under the microscope, not only the stomata of the leaves can be seen, but a vast number of minute parts which seem to be more or less independent of one another in that they are separated by walls of compact substance. In the outer bark of trees, nothing remains but the wallswhich seem to be built of a vast number of small, box-like structures. When cut across, they resemble to some extent the cells of a honey-comb. Because of this resemblance, the name cell was chosen. Originally, cell was used to designate only the inclosed space within the box-like walls. Examination of living plants showed that neither the opening nor the wall was so important in the make-up of t...


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Product Details
  • ISBN-13: 9780217633482
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 112
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 021763348X
  • Publisher Date: 07 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 213 gr


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The Principles of Agronomy; A Text-Book of Crop Production for High-Schools and Short-Courses in Agricultural Colleges
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