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Toxicity of nitrapyrin to sunflower under different N nutrition regimes

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Summary

The purpose of this study was to investigate the phytotoxicity of nitrapyrin 2-chloro-6-(trichloromethyl)pyridine to sunflower (Helianthus annuus L.) under different N regimes and to see if N forms affect the phytotoxicity of nitrapyrin. Sunflower was grown in pot culture for 21 days and was fertilized with (NH4)2SO4, NH4NO3 and NaNO3 to provide 0, 100 and 200 ppm N and with nitrapyrin application of 0 and 20 ppm. All N-treated sunflower plants in all N regimes and regardless of titrapyrin treatment produced more root and shoot dry weights and contained a significantly higher N than untreated check. Nitrapyrin toxicity appeared as a curling of leaf margin and a tendril type of stem growth, the visible toxicity symptoms decreased in the order: (NH4)2SO4>NH4NO3>NaNO3. Furthermore nitrapyrin addition suppressed sunflower growth in each N regime, the suppressing effect being greater with (NH4)2SO4 and NH4NO3 than as with NaNO3. Although, shoot growth from plants receiving nitrapyrin was not significantly affected by any N regime, root growth of nitrapyrin-treated plants was somewhat restricted by NH4 +−N nutrition relative to NO3 −−N nutrition.

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Authors and Affiliations

  1. Department of Soil Science, College of Agriculture, Shiraz University, Shiraz, Iran

    M. Maftoun, A. M. Sameni, M. Darbeheshti, J. Yasrebi & S. M. Hojjati

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  1. M. Maftoun
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  2. A. M. Sameni
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  3. M. Darbeheshti
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  4. J. Yasrebi
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  5. S. M. Hojjati
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Maftoun, M., Sameni, A.M., Darbeheshti, M. et al. Toxicity of nitrapyrin to sunflower under different N nutrition regimes. Plant Soil 65, 411–414 (1982). https://doi.org/10.1007/BF02375061

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  • DOI: https://doi.org/10.1007/BF02375061

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