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This article in AJ

  1. Vol. 64 No. 6, p. 763-766
     
    Received: Feb 24, 1972


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doi:10.2134/agronj1972.00021962006400060017x

Nitrogen-supplying Power of Some Tropical Soils of Puerto Rico and Methods for its Evaluation1

  1. D. J. Lathwell,
  2. H. D. Dubey and
  3. R. H. Fox2

Abstract

Abstract

An evaluation of the N-supplying power of 10 representative Oxisols and Ultisols of Puerto Rico was made by continuous cropping in the greenhouse. Four chemical extraction methods as well as aerobic incubation procedures were used to obtain an index of N availability in these soils. Nitrogen produced during incubation was highly correlated with N released to the crops. Nitrogen extracted by all of the chemical methods used, especially total N extracted by 0.01 M CaCl2 solution and potassium sulfate, was highly correlated with N uptake by plants. These results showed that substantial quantities of N can be removed from these soils upon cropping. It was also shown that laboratory chemical methods as well as incubation procedures provide a reliable means for evaluating the N-supplying power of these soils.

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