1a. Objectives (from AD-416):
Study the effects of combined approaches of deficit irrigation scheduling and conservation tillage systems on cotton production in Australia and the U.S. The proposed research is a multi-disciplinary project involving the integration of breeding, whole-plant physiology, soil science, agronomy, and economics to test the utility of an integrated, producer-friendly irrigation scheduling tool in water-limited production environments. Additionally, this research will enhance our knowledge of whole-plant and system (soil and crop) responses to timed irrigation deficits, physiological impacts of these deficits on plant performance, and the resulting impact on yield and quality.
1b. Approach (from AD-416):
1. Field studies comparing irrigation scheduling treatments utilizing a number of different temperature thresholds embedded in the BIOTIC system. The results from these experiments will help to refine the most appropriate threshold for deficit irrigation systems with limited water in different growing environments. 2. Conduct field trials using BIOTIC scheduling approach in isolation and in combination with other crop measures used for irrigation scheduling (e.g., soil moisture, crop factors), and analyze metabolic and physiological response to these irrigation regimes. 3. Deliver to industry a comprehensive assessment of and guidelines for the use of the BIOTIC for irrigation scheduling in water-limited environments to improve yield, quality, and water use and the impacts on conservation tillage and cover cropping systems on cotton production in water-limited environments.
3. Progress Report:
The U.S. trial for 2013 failed as a result of two extreme weather events that included hail and high winds. The first 4 planting dates were destroyed. Subsequent plantings failed due to equipment failure at sowing. Findings generated from this research in both the US and Australian field sites will be presented in September 2013. A manuscript for the metabolic profiling experiments from 2011 and 2012 is currently being written for submission in November 2013.