Sensors for Detection of Nitrogen in Winter Wheat

A review of papers and patents related to sensor ba sed variable rate technology (sVRT) is presented. The rationale for an sVRT system using optical sensing to vary to p-dress nitrogen fertilization of winter wheat is presented . The current OSU sensor is presented with some of the calibratio n results for the 1996 crop season. Reasonable correlations for use of radiance based NDVI (Perry et al. 1984) for detecti ng vegetative nitrogen mass are presented.

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