About Us | Help Videos | Contact Us | Subscriptions



This article in SSSAJ

  1. Vol. 24 No. 4, p. 286-289
    Received: Dec 7, 1959
    Accepted: Feb 3, 1960

Request Permissions


The Effect of Low Temperatures on Nitrification of Ammonia in Cecil Sandy Loam1

  1. O. E. Anderson2



Anhydrous ammonia (NH3) at the rate of 150 ppm. NH4-N was applied to samples of Cecil sandy loam in the laboratory in a manner simulating field application. Initial concentration at the center of the absorption zone was 800 ppm. NH4-N. NH4NO3 at rates 0, 50, 100, 200 and 400 ppm. NH4-N was also applied to the Cecil soil. Nitrification occurring at 37°, 42°, 47° and 52° F. was studied. Nitrification, though negligible, occurred in all samples at 37° F. At 42°, nitrification became noticeably active by the 3- to 6-week period in NH3 samples, and NH4NO3 samples treated with 50 ppm. NH4-N. Compared to the latter, nitrate accumulation decreased as NH4NO3 concentration increased. This effect was particularly noticeable at 47° and 52° F. where nitrification of NH3 and NH4NO3, up to 100 ppm. NH4-N, was moderate. At 52° F. nitrification approached completion in the 50 ppm. NH4-N samples by the 9th week, and in the NH3 samples by the 12th week. Nitrate accumulation during 12 weeks expressed as a percentage of that occurring at 52° F. was 93, 51, and 8% at 47°, 42°, and 37° F., respectively, in NH4NO3 samples treated with 50 ppm. NH4-N. In samples treated with NH3 it was 72, 35, and 4%, respectively, at the same temperatures.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © . Soil Science Society of America