PLANT GROWTH AND ROOT-KNOT DISEASE OF SOYBEAN UNDER THE STRESS OF SO[sub2] AND O[sub3] GASES MIXTURE

K. Singh, M. W. Khan, M. R. Khan

Abstract


Plant growth and root-knot disease of soybean was evaluated under the stress of SO[sub2] + O[sub3] gases in artificial treatment conditions. Meloidogyne javanica suppressed plant growth significantly but negative effects of nematodes were masked by Bradyrhizobium japonicum to some extent. Plants inoculated with B. japonicum and M. javanica jointly, achieved growth less than B. japonicum inoculated but more than M. javanica inoculated plants. All the considered parameters in this experiment showed remarkable suppressions in different SO[sub2]+O[sub3] mixtures, being highest at 0.2+0.2 ppm, with or without root-knot nematodes and/or root-nodule bacteria. SO[sub2] and O[sub3] interacted synergistically in causing damages to the plant growth particularly in presence of M. javanica.

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