Understanding Cotton Responses to Combined Abiotic and Biotic Stresses for Improving Precision Irrigation Management 

Cotton production in the Northern Murray–Darling Basin is increasingly influenced by complex interactions between climate variability, soil‑water constraints, and emerging disease pressures. This project investigates how cotton plants respond to these combined abiotic and biotic stresses, with a focus on understanding their impacts on transpiration, plant water status, and early‑season growth. By integrating field‑based monitoring with controlled‑environment experimentation, the research will generate new insights that strengthen precision irrigation management and support more resilient, efficient production systems across Australia’s cotton‑growing regions.  

About this project

Cotton production in the Murray-Darling Basin is increasingly shaped by variable seasonal conditions, constrained water allocations, and heightened exposure to climatic and disease‑related stresses. Growers in this region must make irrigation decisions within tight operational windows, often with great uncertainty about how multiple stress factors interact to influence crop water use and early‑season establishment. Current irrigation scheduling frameworks and soil‑water sensing tools do not fully capture the combined effects of temperature extremes, episodic waterlogging, and biotic pressures on cotton transpiration and growth. Addressing this knowledge gap is essential for improving water productivity and reducing production risk across the Basin. 

This project will generate a detailed understanding of cotton plant–water relationships under combined abiotic and biotic stresses. Through a coordinated program of field monitoring and controlled environment experimentation, the research will quantify how aspects of canopy temperature, transpiration, plant water status, and growth dynamics respond to stress interactions during establishment and early vegetative development. Field trials throughout the Northern Murray-Darling Basin will capture real‑world variability in soil moisture, irrigation practices, and climatic extremes, while controlled studies will isolate specific stress combinations to identify physiological thresholds and early indicators of stress onset. 

The resulting datasets will be used to refine soil‑water sensing approaches, improve crop‑water modelling, and develop irrigation scheduling recommendations that better reflect the complexity of stress interactions encountered in northern cotton systems. These outcomes will directly support growers and advisors by providing clearer guidance on when to irrigate, how to interpret plant‑based stress signals, and how to manage water more efficiently under challenging seasonal conditions. 

By delivering practical, evidence‑based insights into how cotton transpiration changes under multiple stress factors, this project will enhance the resilience, efficiency, and sustainability of cotton production in the Northern Murray–Darling Basin and contribute to improved water‑use outcomes for the broader Australian cotton industry. 

Expected Outcomes

The project is expected to deliver improved understanding of how combined abiotic and biotic stresses influence cotton transpiration, plant water status, and early‑season growth. By integrating advanced sensing technologies and controlled‑environment experimentation, the research will generate practical insights that strengthen irrigation scheduling and soil‑water management. Expected outcomes include refined sensor thresholds, enhanced crop‑water modelling, and evidence‑based recommendations that support growers in making more precise irrigation decisions. These advances will contribute to improved water‑use efficiency, reduced production risk, and more resilient cotton systems across the Northern Murray–Darling Basin.