Conjunctive In-season Water and Nitrogen Management for Improved Production
Conventional center pivot irrigation management treats the field area as a homogeneous unit in terms of irrigation requirements and water application. Similarly, when nitrogen is applied through the irrigation system, nitrogen requirements and application to the field area are also managed uniformly. Spatial variability in water and nitrogen requirements often develops throughout the growing season. Enhancements to center pivot irrigation systems which enable site-specific in-season water and nitrogen management have the potential to increase production efficiency through increased water and nitrogen use efficiency. The overall objective of this project is to demonstrate that improved water and nitrogen use efficiency can be attained in the field using a center pivot irrigation system equipped for site-specific in-season water and nitrogen
management. The specific objectives are to: 1) implement a separate, spatially variable chemical application system on a center pivot system currently equipped for spatially variable water application; 2) use the center pivot irrigation system to impose treatments of uniform and site-specific water and in-season nitrogen management and compare water and nitrogen use efficiency under both management treatments.