Abstract
Nitrogen (N) fertilizer is a major input for rice. Only 30Ð40% of applied N is used by the crop, however, due to losses through volatilization, denitrification, leaching, and runoff (De Datta and Buresh 1989). Deep placement of urea, split N application, preplanting incorporation of coated and controlled-release urea (CRU), and the chlorophyll meter and leaf color chart techniques are some N management strategies that could reduce N losses and improve fertilizer use efficiency in rice (Katyal et al 1985, Kumar et al 1989, Peng et al 1996, Balasubramanian et al 1999). Since rice varieties differ in N use efficiency (NUE), this study was conducted to determine their response to selected N management techniques.
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