Efficient water and nutrient management represent a major challenge in modern wheat production systems, especially under increasing climatic variability. Beyond yield response, understanding the interaction between irrigation scheduling, soil moisture dynamics and nitrogen availability is essential for optimizing crop performance. This study aims to evaluate the effects of stage-specific sprinkler irrigation on soil water regime and nitrogen forms, and their influence on wheat yield formation under the pedoclimatic conditions of the Insula Mare a Brăilei, Romania. The experimental field is established within the Agricultural Research and Development Station Brăila, using a multifactorial design that includes irrigation regimes applied at key phenological stages (stem elongation, heading and grain filling), wheat varieties adapted to local conditions, and two crop density levels. Soil analyses focus on moisture content and nitrogen dynamics, including nitrate (NO₃⁻), ammonium (NH₄⁺) and related forms, monitored in relation to irrigation timing. Plant measurements include growth parameters, yield components and grain quality indicators such as protein and gluten content. The working hypothesis assumes that irrigation applied at critical growth stages modifies soil moisture distribution and nitrogen availability, improving nutrient uptake efficiency and contributing to yield stability. Preliminary observations indicate that irrigation timing influences both nitrogen transformation processes and plant response, suggesting a strong interaction between water management and nutrient dynamics. The expected results will contribute to the development of integrated irrigation strategies that optimize both, water use efficiency and nitrogen utilization, providing practical recommendations for high-performance wheat production systems under local environmental conditions.

soil moisture; nitrogen dynamics; nitrate; ammonium; water use efficiency

agronomy

Presentation: poster