Heat map represents the average stress stability of common hard spring wheat varieties to terminal drought and nitrogen (N) stress in trials conducted in Yolo and Fresno Counties of California during the 2019-20, 2020-21, and 2021-22 seasons. Stability is measured as the relative performance of an individual variety in the unstressed conditions plus or minus its relative performance in the stress conditions at the same location (for more info see illustration at the bottom of the page). Terminal drought and N stress responses are based on averages of three site-years of data. Stress trials are managed identically except for the exclusion of irrigation after the vegetative growth period (terminal drought) or the exclusion of N fertilizer additions throughout the season (N stress).
2019-20 – 2021-22 Summary
2018-19 – 2020-21 Summary
2017-18 – 2019-20 Summary
2016-17 – 2017-18 Summary
How are these results calculated?