The response of a sorghum sudangrass cover crop to residual nitrogen and its relationship with spectral sensors
2024
Julia Barra Netto‐Ferreira | Diego Arruda Huggins deSá Leitão | Winniefred Griffin | Lakesh K. Sharma | Gabriel Maltais‐Landry
Abstract A sorghum sudangrass (SSG) cover crop grown after a cash crop could take up residual nitrogen (N) before it is lost. As in‐field monitoring of SSG properties is laborious, predicting biomass and N concentrations with spectral sensors could be useful. At two sites in Live Oak, Florida, we evaluated the response of SSG to residual N from previous N fertilization and the performance of handheld and satellite sensors in estimating SSG properties. We quantified aboveground biomass, plant N, leaf greenness (NDVI), net potential N mineralization (PNM), and soil permanganate oxidizable carbon (POXC). Residual N did not affect SSG properties, PNM was highest at the highest N input rate in one site, and soil POXC was correlated with SSG properties (biomass and plant N). NDVI measured from a handheld sensor better predicted SSG properties than satellite imagery in these small plots, suggesting a greater potential to be a useful management tool.
Show more [+] Less [-]Bibliographic information
This bibliographic record has been provided by Directory of Open Access Journals