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Plant and Soil

, Volume 125, Issue 2, pp 255–262 | Cite as

Comparative effects of organic and inorganic nitrogen sources applied to a flooded soil on rice yield and availability of N

Article

Abstract

A pot experiment was conducted to study the effect of organic and inorganic nitrogen (N) sources on the yield and N uptake of rice from applied and native soil-N. The residual effect of these N sources on a succeeding wheat crop was also studied. Organic N was applied in the form of 15N-labelled Sesbania aculeata L., a legume, and inorganic N in the form of 15N-labelled ammonium sulphate. The two sources were applied to the soil separately or together at the time of transplanting rice.

Recovery of N by rice from both the applied sources was quite low but both sources caused significant increases in biomass and N yield of rice. Maximum increase was recorded in soil treated with organic N. The residual value of the two materials as source of N for wheat was not significant; the wheat took up only a small fraction of the N initially applied. Loss of N occurred from both applied N sources, the losses being more from inorganic N.

Both applied N sources caused a substantial increase in the availability of soil-N to rice and wheat; most of this increase was due to organic N and was attributed to the so-called ‘priming’ effect or ANI (added nitrogen interaction) of the applied material.

Key words

added N interaction flooded soil nitrogen availability 15priming effect rice soil nitrogen 

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Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • F. Azam
    • 1
  1. 1.Soil Biology DivisionNuclear Institute for Agriculture and BiologyFaisalabadPakistan

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