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This article in SSSAJ

  1. Vol. 51 No. 6, p. 1653-1656
    Received: Nov 24, 1986

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Effectiveness of Calcium Cyanamide as a Nitrogen Source and Nitrification Inhibitor in a Tropical Soil1

  1. Y. Arora and
  2. L. A. Nnadi2



Field experiments were conducted to test the efficiency of calcium cyanamide (CaCN2) as an N source for wheat (Triticum aestivum L.) and maize (Zea mays L.) over four cropping seasons at the Irrigation Research Station at Kadawa (10°39′N, 08°02′E) Nigeria. Calcium cyanamide applied at recommended N rates, was compared with urea (120 kg N ha−1) and a mixture of urea and CaCN2 [urea (110 kg N) plus CaCN2 (10 kg N ha−1)]. Highest maize grain yields and N uptake were obtained with the mixture of urea and CaCN2 in both years of the study. Wheat yields were unaffected by form of N. Recovery of inorganic N (NO-3 + NH+4) in the surface soil, 8 weeks after planting wheat in 1984 to 1985, was greatest for the CaCN2 treatment followed by the urea-CaCN2 mixture, and urea in tha torder. Nitrogen recovery in the 0.6-m depth was approximately the same for all treatments. A laboratory incubation study using the same soil gave about 80% recovery of inorganic N from added CaCN2 within 8 weeks with most of the N remaining as NH+4 throughout the 8-week study. Addition of 10 mg kg−1 of N as CaCN2 to the soil inhibited the nitrification of added urea.

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