Agricultural scientists especially soil scientist are measuring nitrogen use efficiencies in various crop varieties under different nutrient managements. Though this method has got more precision in measuring NUE, it is limited to small / specific area. In order to study N use efficiency in larger area with multiple crop varieties, remote sensing drone technology will be highly useful. Any study relating N uptake, N utilization or N use efficiency of the crop with remote sensing technology is invited for discussion and fine tuning the research proposals.
Spade meter and green seeker are the instruments which works as non contact devices to measure the stress in the crop due to nutrients. That can be upscaled using the NDVI provided by the satellite data at larger scale. There are numerous studies carried out on in the field of precision farming and conservation agriculture which helps in the application of need based nitrogen and it's use efficiency.
Maybe this paper can help you. It's about NUE
Article Chloride Improves Nitrate Utilization and NUE in Plants
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