Field experiment on use of converter furnace slag to control clubroot disease in broccoli
2004
Murakami, K. (Tokyo Univ. of Agriculture (Japan)) | Shinoda, H. | Maruta, R. | Goto, I.
A field experiment was conducted in Mitaka City, Tokyo on the use of converter furnace slag and fungicide treatments to control clubroot disease in broccoli. A field area (8 ares) infected by Plasmodiophora brassicae was divided into amelioration and control plots. The amelioration plot received 100 tons per hectare of converter furnace slag ; both plots received 4 fungicide treatments (no treatment, quintozene, fluazinam and flusulfamide). Broccoli seedlings were then transplanted to all plots and cultivated for 3 months. The soil pH (H20) of the amelioration plot was 5.9 before slag application, 7.5 before broccoli transplantation and 7.9 after harvesting. Clubroot disease incidence in the control plot (no slag, with fungicide) was 90% ; very serious damage to the broccoli was recognized. The control plot clearly showed the effects of fungicide use, but djsease incidence could not be decreased below 30%. In the amelioration plot, by contrast, disease incidence decreased to 20% in the no-fungicide plot and to 10% in the fungicide-treated plot. The boron content in broccoli leaves from the amelioration plot was about twice that in the control plot, despite a soil pH above 7. There were no differences between amelioration and control plots in terms of broccoli leaf manganese, vitamin-C or reducing sugar content. The above results indicate that converter furnace slag is very effective in controlling clubroot disease, and can help reduce fungicide use on farmland.
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