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Effect of carbendazim, imazetapir and thiram on nitrogenase activity, number of microorganisms in soil and yield of hybrid lucerne [Medicago media]

100%

Niewiadomska A. , Sawicka A.

2002

tom 11

nr 6

In field and pot experiments the effect of selected pesticides on the nitrogenase activity, number of soil microorganisms, and yield of hybrid lucerne was investigated. The obtained results show that crop protection preparations applied in the experiment (seed dressing compound Funaben T and Pivot 100SL herbicide) reduced the activity of nitrogenase in the active strain of Sinorhizobium meliloti both under conditions of pot and field experiments. In addition, the authors observed a noxious influence of the applied pesticides on nodulation, root development and yield of lucerne. Furthermore, in the first days after their application, the employed herbicide and fungicide inhibited multiplication of soil microorganisms under lucerne plantations, while later they were found to stimulate their multiplication.

Pesticide side effect on the symbiotic efficiency and nitrogenase activity of Rhizobiaceae bacteria family

75%

Niewiadomska A. , Klama J.

nr 1

The laboratory experiments tested the influence of selected pesticides on the symbiotic efficiency and nitrogenase activity of Rhizobium teguminosarum bv. trifolii KGL, Sinorhizobium melilotii Bp and Bradyrhizobium sp. Ornithopus B bacteria entering into symbiosis with clover, lucerne and serradella, respectively. The results obtained indicate that the pesticides used in the experiments (Funaben T seed dressing and Pivot 100SL herbicide) caused reduced nitrogenase activity in active strains tested. In addition, a toxic effect of the applied pesticides on the nodulation and root growth of the tested plants was observed.