Herbicides reduce azolla growth [Philippines]
1986
Janiya, J.D. | Moody, K. (International Rice Research Inst., Los Banos, Laguna (Philippines). Agronomy Dept.)
When azolla is inoculated in transplanted rice fields to fix N, it also competes with weeds by rapidly covering the water surface. However, it does not control all weeds. Except for thiobencarb, piperophos-2,4-D, and oxadiazon, all herbicides significantly reduced azolla fresh weight by 10 d after treatment. The proprietary mixture of molinate-simetryn-MCPB was most damaging to azolla. Herbicides did not affect azolla N content. By 20 d after treatment, all herbicides reduced azolla growth. Molinate-simetryn-MCPB killed all azolla. Thiobencarb was least harmful, reducing azolla fresh weight 29% compared to the untreated check. The herbicides had no significant effect on azolla N content. However, had azolla been incorporated 20 d after herbicide application, there would have been significant difference in the amount of N incorporated because of the different fresh weights. Weed control measures other than herbicides should be used when azolla is grown
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