Information on Seasonal and Varietal Differences Provide Opportunities for Improving Nitrogen Use efficiency

Nitrogen pays key role in plant growth and development. Despite being abundant in the atmosphere, it isone of the limiting plant growth nutrient. Additional N has been shown to increase yield ofrice with temptationof over-supplyby some farmers, witha resultant lowerN use efficiency, higher costs and environmental pollution.

Apart from nitrogen rates, there arefactors such as temperature, stage of crop growth during nitrogen fertilization as well as cultivar responses to N applicationthataffect yields and Nefficiencies.The current results showeddifferencesin NUESamongst cultivars and rates of N application across the sites.