Fertilizer research

, Volume 44, Issue 3, pp 169–175 | Cite as

Use of nitrification inhibitors (neem and DCD) to increase N efficiency in maize-wheat cropping system

  • S. N. Sharma
  • R. Prasad


A 2-year field experiment was conducted to study the effects of the nitrification inhibitors dicyandiamide (DCD) and neem cake on the efficiency of applied prilled urea nitrogen in a maize-wheat cropping system. Prilled urea (PU), neem cake coated urea (NCU) and DCD blended urea (DCDU) were applied to maize at two levels (60 and 120 Kg N ha−1) and two methods (all preplant and split) of N application along with a no-nitrogen control and their relative residual effect was studied on succeeding wheat grown with three levels of N as PU.

In 1990 maize responded well to N up to 60 kg N ha−1; at this level PU increased maize yield by 1.03 t ha−1, whereas NCU and DCDU increased maize yield by 1.55 and 1.18 t ha−1 over the control, which was equivalent to an application of 127 and 94 kg N ha−1 as PU, respectively. Furthermore, when the results were averaged over two years of study, residual N from the application of NCU and DCDU at 60 kg N ha−1 left after maize cropping increased the grain yield of the succeeding wheat crop grown with 60 kg N ha−1 as PU by 1.97 and 1.68 t ha−1, respectively, over a no nitrogen control or 60 kg N ha−1 as PU applied to the maize. This was equal to an application of 96 and 82 kg N ha−1 as PU to wheat.

Thus, neem cake increased the efficiency of urea N applied to maize and benefits were also seen in the succeeding wheat yield in the maize-wheat cropping system.

Key words

neem cake dicyandiamide prilled urea nitrogen response residual N response 


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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • S. N. Sharma
    • 1
  • R. Prasad
    • 1
  1. 1.Division of AgronomyIndian Agricultural Research InstituteNew DelhiIndia

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