Bulletin [Of Cornell University Agricultural Experiment Station] - New York (State). Agricultural Experiment Station, Ithaca Volume 411-429

Bulletin [Of Cornell University Agricultural Experiment Station] - New York (State). Agricultural Experiment Station, Ithaca Volume 411-429

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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. 1922 edition. Excerpt: ... the most profitable yields, and this is a strong argument for the use of acid phosphate on more farms, and also in larger amounts on farms now using fertilizer, even tho the annual replacement of phosphorus is now equal to its removal, considering the farms as a group. More potash is removed than is returned, but, since these soils are fairlv well supplied with this element, the depletion of potash is not serious. No system of dairy farming can return as much potash as is removed in crops, and be profitable. Lime is removed from the soil in considerable amounts by crops, but the largest loss is thru percolation. These losses are serious with all soils, and especially so with those deficient in lime. On such soils enough lime should be added to replace the removal. But, even tho liberal surface application be made, it is impossible to provide a distribution in the soil and the subsoil which will make non-calcareous soils as effective as natural limestone soils for the prodiiction of crops. If one allows for a recovery in manure of 60 per cent of the calcium contained in the feedstuffs used by animals, and assumes that acid phosphate contains 22 per cent of CaO and that the complete fertilizers carry an amount of CaO proportionate to acid phosphate, there appears to be added to the crop land 52 pounds of CaO per acre, against a removal of 16 pounds per acre by crops. It is probably safe to say that three times as much CaO is being added under the prevailing system of farming as is removed by the crops. If one allows for a recovery of 45 per cent of the organic matter in the feeds used by stock, and assumes the soils to contain 4 per cent of organic matter, apparently about 1.9 per cent of the organic matter of the soil is returned...show more

Product details

  • Paperback
  • 189 x 246 x 15mm | 508g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236856236
  • 9781236856234