SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 51:1653-1656 (1987)
© 1987 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effectiveness of Calcium Cyanamide as a Nitrogen Source and Nitrification Inhibitor in a Tropical Soil1

Y. Arora and L. A. Nnadi2

ABSTRACT

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.

NOTES

1 Contribution from Institute for Agricultural Research/Ahmadu Bello Univ., P.M.B. 1044, Zaria, Nigeria.

2 Senior Lecturer and Principal Research Fellow, respectively. Senior author's present address is 173, East-51, Vancouver, B.C. Canada.

Received for publication November 24, 1986.




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Copyright © 1987 by the Soil Science Society of America.