Rainfed lowlands constitute nearly half of the total rice area in Bihar (2.7 million ha). The rice crop depends on the monsoon. When the monsoon is delayed, rice planting is also delayed. No high-yielding varieties (HYVs) are suitable for delayed conditions mainly because they flower at the end of October when low temperature sets in, causing nonuniform flowering and poor seed setting. Farmers therefore rely on traditional photoperiodsensitive, tall cultivars that are tolerant of cold at flowering. HYVs are consequently grown under favorable conditions only.