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Fluid Journal : Winter 2018
12 The Fluid Journal Winter 2018 nutrient deficiencies in a field setting without the need of ground trothing. To test this theory, a multi-spectral imager will be used in the future to query different visible and infrared spectrums to identify a unique spectrum for N and S deficiencies in cotton. N/S formulations. When S fertilizer source was evaluated over four S Applications, S source was significant at two of three locations (Figure 2). At the SHC location, the UAN 32 + ATS produced significantly higher petiole S concentrations than the broadcast granular urea + AMS, whereas at the LEW location, the granular N/S formulations produced significantly higher petiole S concentrations (Figure 2). At the SHC location, the UAN32 + ATS produced significantly higher petiole S concentrations than the broadcast granular urea + AMS, whereas at the LEW location the granular N/S formulations produced significantly higherpetiole S concentrations (Figure 2). At the LEW location, there was significant interaction between S source and application rate with the broadcast N /S formulation having significantly higher petiole S concentrations with only 10 lbs S per acre (1,448 ppm S) than all S application rates for the UAN32 + ATS from 10 - 30 lbs S per acre, which were 690, 977, and 842 for 10, 20, and 30 lbs per acre. This was the only location in 2016 where an interaction between N/S formulation and S application rate was observed for petiole S concentrations. This interaction was not present in leaf S concentrations at LEW (data not shown).