Effects of Nitrogen Timing and Split Application on Blast Disease in Upland Rice

Nitrogen is essential for increased upland rice productivity, but the severity of blast disease increases with N application. The potential to suppress blast disease through timing and splitting of N application was tested during the 1987 and 1988 wet seasons in the Philippines on a strongly acidic soil. We studied the effects of 90 kg of N per hectare applied as two early-split applications, two late splits, three equal splits, and five equal splits on disease progress, crop growth, and yield (.)