Abstract
The objectives were to calibrate the Soil Plant Analysis Development (SPAD) and Green Seeker (GS) as tools to determine the differential of the economic optimum nitrogen rate (dEONR) at different growth stages of barley and to evaluate if a single SPAD or GS calibration model can be used for two cereal crops: barley and spring wheat. Fourteen field experiments were conducted (2016–2018) evaluating five N rates. Relative canopy indices were determined using a SPAD-502 (rSPAD) and a GS sensor (rNDVI) at Z24, Z31, and Z39 growth stages. The relationship between sensor indices and dEONR was evaluated by fitting quadratic-plateau (QP) regression models. Data from a previous study was used to evaluate if a unique QP model could predict dEONR from canopy indices for barley and wheat. Statistically significant QP models were determined for rSPAD and rNDVI at all evaluated growth stages. The sensitivity of these models was greater for rSPAD (0.0006 on average) than for rNDVI (0.0004 on average). A single QP model was developed to predict dEONR from rSPAD at Z31 and Z39 barley growth stages (R2 = 0.68). Also, a unique model was developed to predict dEONR from rSPAD at Z31 and Z39, but not only for barley but also for wheat (R2 = 0.64). A single model could be used to determine variable in-season N rates for barley and wheat, increasing the N use efficiency and limiting possible negative economic and environmental impacts of fertilization over the agroecosystems.
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Data Availability
The raw data that support the findings of this study are available from the corresponding authors, N.I.R.C and N.W., upon reasonable request.
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Funding for this research project was provided by FONCyT PICT 2016-0304, UBACyT 20020170100689BA, UNMdP AGR534/17, and INTA 2019-PE-E1-I011-001.
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Reussi Calvo, N.I., Wyngaard, N., Queirolo, I. et al. Canopy Indices: a Model to Estimate the Nitrogen Rate for Barley and Wheat. J Soil Sci Plant Nutr 20, 2419–2430 (2020). https://doi.org/10.1007/s42729-020-00307-w
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DOI: https://doi.org/10.1007/s42729-020-00307-w