Soil Report Volume 8

Soil Report Volume 8

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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. 1913 edition. Excerpt: ...bushels per acre in 1910, 23.6 in 1911, and 22.0 in 1912, while on duplicate plots treated with six tons per acre of ground limestone and the limited amount of organic manures produced upon the land, the corresponding yields were 41.4 bushels in 1910, 41.3 in 1911, and 50.1 in 1912. These results show an average increase of 20.6 bushels, of which only 6.6 bushels are due to organic manures. As an average of duplicate tests with each crop each year for three years, the ground limestone increased the yields by 14 bushels of corn, 10.55 bushels of oats, .85 ton of hay (clover or cowpea), and 4.45 bushels of wheat. The value of these increases at 35 cents for corn, 30 cents for oats, 70 cents for wheat, and $6 for hay, amounts to $16.28 and corresponds to the value of the increase produced by limestone on one acre during a four-year rotation. Thus the limestone paid about 200 percent interest on the investment, and the application of 6 tons per acre is sufficient for about fifteen years, altho in order to maintain a liberal amount of limestone in the soil it is well to apply about 2 tons per acre every four or five years after making the heavier initial application. Owing to the low supply of active organic matter in the soil at Raleigh, phosphorus produced no benefit, as an average, during the first two years; but with the turning under of the crop residues and farm manure in proportion to the crops produced, the effect of phosphorus is seen to some extent in the crops of 1912 and 1913. The fourth series of plots will receive its first farm manure for the 1914 crops, so that trustworthy data as to the benefits of organic matter, or of phosphorus combined with organic matter, will not be secured before the second rotation period. Where kainit..
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Product details

  • Paperback | 26 pages
  • 189 x 246 x 1mm | 68g
  • United States
  • English
  • black & white illustrations
  • 1236742141
  • 9781236742148