Time and rate of nitrogen application on upland rice were studied under no-till systems upon field blast (Pyricularia grisea) occurrence, grain yield and seed sanitary quality. The study was conducted in 2001/2002 at Agriculture and Livestock Research Institute (EPAMIG) Experiment Station at Lavras MG, Brazil. There were significant interactions of leaf blast and Dreschslera oryzae fungi with rate and time of the nitrogen application. Split application of nitrogen affected the panicle neck blast, and the higher the rate of nitrogen applied on primary flower differentiation the greater disease severity. Increased N rates favored seed P.grisea incidence and rice yield. By splitining nitrogen application on upland rice, higher rates should be concentrate next to primary flower differentiation, when the use of this element is more efficient.
Upland rice; no-till; nitrogen; blast, and seed quality
