Efeito de fungicidas protetores e sistêmicos e molibdênio, na emergência, produção e fixação simbiótica do nitrogênio em soja (Glycine max (L) Merril)
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organismos patogênicos, qualidade sementes, tratamento fungicidas, produção grãos, fixação nitrogênioResumo
This study was carried out in Viçosa and Ponte Nova, State of Minas Gerais, to evaluate the effects of treating 'Santa Rosa' soybean seeds with a slurry of fungicides and molybdenum oxide (Mo03, 13g/ha). Emergence, grain yield and nodulation were then analyzed after inoculation with 0.4% Rhizobium japonicum. The fungi Colletotrichum truncatum and Cercospora kikuchii were also detected on the seeds prior to planting.
In Viçosa, 20 days after sowing, the highest emergence rates (100% more than controls) were produced by mixtures of 0.2% Captan + 0.2% Carboxin with or without Mo03. The second- highest rates were produced by these fungicides separately. Forty days after sowing, the highest emergence rates were still produced by 0.2% Captan + 0.2% Carboxin, but there was a tendency toward equalization of all treatments. The highest yield (30.86% over controls) was produced by 0.2% Captan +0.2% Carboxin + Mo03. Treatments of Mo03 alone increased yield by 382 kg/ha. A positive correlation (r = 0.57; p< 0.05) was also observed between leaf nitrogen content and seed yield.
In Ponte Nova, the highest emergence rates (150% over controls) were produced by treatments of 0.4% Thiram or Captan. Yield and nodulation were not significantly effected by any treatment.
Referências
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