The Book of the Farm Volume 3

The Book of the Farm Volume 3

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1889 edition. Excerpt: ...with one atom of phosphoric acid to form the salt termed phosphate of lime. The combination may be stated thus, it being remembered that the atomic weight of calcium is 40, oxygen 16, and phosphorus 31: --In other words, 168 parts of lime are combined with 142 parts of phosphoric acid in the one instance, and 224 parts of lime with 142 parts of phosphoric acid in the other. That is to say, in Thomas slag the acid is combined with too great a proportion of lime to enable it to cohere firmly. To put it in still another way, its chemical affinity is weakened from being over-saturated with lime, so that the compound is more readily broken up. Hence the solubility of Thomas slag. Oxide of Iron in Slag.--There seems to be one drawback which, in the opinion of many farmers, detracts from the value of slag as a manure. This is the great quantity of oxide of iron in its composition, many samples containing from 10 to 20 per cent and over. From experiments conducted by Sir John B. Lawes, and in Germany, it seems that the presence of this material has little or no effect on the growth of crops. The farmer, therefore, just loses the value of the fertilising ingredients in proportion to the quantity of this substance which may be present in the slag bought by him. Composition of Slag.--Slag also contains, beside phosphate and silicate of lime, a considerable quantity of caustic or free lime and magnesia. The following is an average analysis of Thomas slag: --sulphuric acid, and the ammonia escapes in a volatile state into the atmosphere. Further information on this point will be found under mixtures and mixing. Soluble Phosphates or Superphosphates. When Sir John Bennet Lawes, about the year 1840, announced that he could obtain soluble phosphate of lime more

Product details

  • Paperback | 164 pages
  • 189 x 246 x 9mm | 304g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236612833
  • 9781236612830