Date of this Version
ANNUAL REPORT OF THE BEAN IMPROVEMENT COOPERATIVE, No. 60, March 2017. Published by USDA.
INTRODUCTION Breeders and physiologists continue to seek phenotypic and genetic markers that are easy to measure and help predict yield.
METHODS In 2015, 49 dry bean genotypes from varying market classes were sown on 19 June 2015 on a Haverson and McCook loam at Lingle (WY). Experimental design was a split-plot with irrigation level the main plot and genotypes (one row only, 6 m, 76-cm spacing) assigned to subplots. Irrigation levels were “unstressed” (for the season) vs. “partial drought.” Partial drought consisted of full irrigation pre-bloom but was followed by approximately irrigation at 50% potential evapotranspiration post-bloom. There were two replicates per genotype per water regime. The fully irrigated plot received 6.09 inches of supplemental water while the limited plot received 2.38 inches of supplemental water (irrigation was performed weekly). Other details of the methods are provided in Heitholt and Baumgartner (2016). Canopy temperatures were recorded on 9 August with a Spectrum Technologies IR Temp Meter.
A second and similar study was sown on 27 May 2016 at Lingle (WY) with 23 genotypes on a Haverson, McCook loam and a Heldt silty clay. Plots (four rows) were 5 m long with 76-cm rows. Differential watering (0.75 inches vs. 0.50 inches) was employed at each irrigation post-bloom with a split-plot arrangement (three replicates per genotype per irrigation regime). Canopy temperature was recorded mid-morning and mid-afternoon on 23 July with an Apogee MI-2H0 infrared thermometer several days after a differential watering. Other methodological details for this second study are provided in Heitholt et al. (2017). A hail storm on 27 July terminated the crop and no yield data was collected.