Effect of Linuron and Dinosebacetate on Vicia faba-Rhizobium leguminosarum Symbiosis

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A field experiment was conducted at the experimental station of Hannover University to study the effect of the herbicides linuron and dinosebacetate on nitrogen fixation, yield, and yield components in broad bean (Vicia faba L.) There were four treatments or concentrations of the herbicides, viz. control (no herbicide), 50, 100, and 200% of the recommended does used in agricultural practice, each replicated 6 times. The results indicated that linuron was more effective for weed control and its phytotoxicity (at 200% concentration) in terms of parameters like nodule and planet dry weight, nitrogenase activity and yield was higher than that of dinosebacetate. Although the plant dry matter was not significantly reduced by any of the two herbicides regardless of the concentration, nodulation was suppressed drastically at the highest concentrations (38% for linuron and 20% for dinosebacetate). Nitrogen fixation rate was reduced by ca. 40% by both herbicides at 7 weeks after sowing. Linuron also affected adversely the nitrogen content of different plant parts (more than 30% reduction in the shoot nitrogen content).
社団法人日本土壌肥料学会の論文