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This article in SSSAJ

  1. Vol. 32 No. 5, p. 679-682
    Received: Feb 22, 1968
    Accepted: May 20, 1968

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Effect of Partial Removal of Soil Organic Nitrogen with Sodium Pyrophosphate or Sulfuric Acid Solutions on Subsequent Mineralization of Nitrogen1

  1. George Stanford2



Studies were conducted with Chester loam and Elliott clay loam soils to determine the relationship between amounts of N extracted by Na-pyrophosphate solutions and reduction in capacities of the soils to mineralize N under anaerobic conditions. By employing wide variations in concentration and pH of the extractant, number of extractions, temperature, and extraction time, a broad range was achieved in total amounts of N extracted (40-1,200 ppm). Accompanying reductions in soil N mineralization during 10–11 weeks ranged up to 125–170 ppm, respectively, with the Elliott and Chester soils. A close similarity in susceptibility to mineralization of N extracted from the two soils is indicated, although relative amounts of extractable N differed appreciably.

Acid hydrolysis of Elliott soil with 6N H2SO4 for 12–16 hours reduced N mineralization capacity of the soil to zero. These findings may have important implications in defining criteria for selecting the concentration of an extractant suitable for use in assessing the N status of soils.

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