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Second year: Overhead irrigation and nitrogen rates effects on corn water use and yield response based on soil-moisture sensors thresholds
Proceedings of the 2023 Mississippi Water Resources Conference
Year: 2023 Authors: Vargas A., Gholson D., Lo H., Singh G., Krutz J.
Groundwater is the most exploited resource for furrow irrigation in Mississippi. The overuse and excessive pumping from agriculture and fisheries have exceeded the natural water recharge of the Mississippi River Valley Alluvial Aquifer. Limited research is available on using overhead irrigation systems in corn production systems in the Mississippi Delta. Therefore, understanding the relation between sensor-based irrigation scheduling and nitrogen management using a lateral move system is essential to effectively apply water and nitrogen (N) for sustainable production. The objective of this study was to evaluate the effects of sensor-based irrigation with different nitrogen rates on corn yield. This is our second year, the field was established at Delta Research and Extension Center, Mississippi State University, Stoneville, MS in 2022. Treatments included in this study were three irrigation scheduling thresholds (-40, -70, and -100 kPa) and a rainfed treatment, four N rate applications (0, 112.3, 224.5, and 336.8 kg ha-1), and two distinct soil textural classes (Sandy Loam and Clay). Data collected included SPAD meter readings, grain N uptake, corn grain yield, and irrigation water use efficiency. Results will be presented at the conference. Corn grain yield was adjusted to 15.5% moisture prior to analysis. Data was analyzed using the GLIMMIX procedure in SAS statistical software at a p-value of 0.10. The results of this research will be presented at the conference.