Impact of N-Levels on Outbreaks of Rice Blast Disease Caused by Magnaporthe grisea under Temperate Conditions

摘要

Nitrogen is essential for increased irrigated rice productivity in Kashmir, but the severity of leaf blast and neck rot is increased with N-application. The potential to evaluate N-application against the status daring 2005 and 2006 in Kharif seasons at Khudwani Anantnag (J & K). Moderately resistant rice variety of Chenab was tested for die response of N-levels in relation to outbreaks of blast disease. Sowing was undertaken on 6 May and plantings, on 15 June. Under irrigated conditions, observations revealed that highest basal dose of nitrogen (50 kg/ha) exhibited maximum intensity of leaf blast (30.70) and neck rot (5.50), but it was increased when 25 kg N applied after 30 days of transplantation, whereas grain yield was also increased as compared with the 20 kg/ha basal dose of nitrogen in both the yearn. The maximum yield was recorded when 30 kg N/ha was applied as basal dose followed by 15 kg N/ha applied after 30 days of transplantation even blast disease occurred more than without N-applications.