Summary
Relative compatibility of selected pesticides at two levels of application (recommended rate and 5× or 10 ×) with soybean-rhizobia symbiosis was tested in pot culture experiments using a prepared peat inoculant.
PCNB, carboxin and carboxin+captan at recommended level were innocuous to growth, nodulation, N2-fixation and total N content of shoot. Carboxin and carboxin+captan but not PCNB at 10 times recommended level proved detrimental to nodulation and N2-fixation. Carbaryl and malathion at recommended level had no adverse effect but at 10 times recommended level severely reduced N2-fixation but not other parameters. Acephate, diazinon and toxaphene at both levels reduced N2-fixation and total N content but not growth and nodulation. All five herbicides used at recommended and 5 times recommended level adversely affected nodulation and N2-fixation. Glyphosate proved least toxic to all parameters. 2,4-DB at recommended level was less harmful to nodulation and N2-fixation than trifluralin, alachlor and metribuzin.
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Mallik, M.A.B., Tesfai, K. Pesticidal effect on soybean-rhizobia symbiosis. Plant Soil 85, 33–41 (1985). https://doi.org/10.1007/BF02197798
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DOI: https://doi.org/10.1007/BF02197798