experimental rate of each herbicide caused near-total mortality of the bedding plants tested, which results in more accurate calculation of EC 10 values (the effective concentration of herbicide expected to cause a 10% reduction in dry weight compared with
of the foliage plants tested, which results in more accurate computation of the effective concentration of herbicide expected to cause a 10% reduction in dry weight compared with control plants (EC 10 ) derived from regression analysis. All
·m −1 , EC 5 or EC 10) in the greenhouse ( n = 8). From 7 Mar. to 11 Apr., treatments were applied on a weekly basis by irrigating plants with 1 L nutrient solution (control) or saline solutions at EC of 5.0 or 10.0 dS·m −1 with 10% to 20% leaching
-plot design with the salinity treatment as the main plot and 10 species as the subplot with 10 replications per treatment per species. Saline solutions at EC of 5.0 dS·m −1 (EC 5) and 10.0 dS·m −1 (EC 10) were made by adding 1.20 g·L −1 sodium chloride
.2 dS·m −1 , control) and saline solutions [EC of 5.0 dS·m −1 (EC 5) and 10.0 dS·m −1 (EC 10)]. The average air temperature in the greenhouse was 27.4 °C day/23.0 °C night. The average daily light integral of ambient light was 12.5 mol·m −2 ·d −1 and
adding 1 g·L −1 15N–2.2P–12.5K (Peters 15–5–15 Ca–Mg Special; Scotts, Marysville, OH) to RO water. Saline solutions at an EC of 5.0 ± 0.1 dS·m −1 (EC 5) and 10.0 ± 0.1 dS·m −1 (EC 10) were prepared by adding 20.6 m m sodium chloride (NaCl) and 10.4 m
·m −1 (EC 10)] in a greenhouse. Plants were harvested after the fourth (first harvest, 5 weeks after initiation of treatment) and eighth treatment (second harvest, 9 weeks after initiation of treatment). Treatments. A nutrient solution at an EC of 1
solution: EC = 10.0 dS·m −1 (EC 10). By choosing this high salinity level, plants could have quick response to salt stress in a short-term study. There were 10 plants per treatment per cultivar, a total of 360 and 200 plants in College Station and El Paso
models were used to calculate EC 10 , EC 50 , and EC 90 values—the concentrations that reduce biomass by 10%, 50%, and 90% compared with untreated control plants—for each herbicide-species combination. The EC 10 value is conservative and was selected to
9.73 ± 0.29 dS·m −1 (EC 10) as the other saline treatment. The pH of all solutions was adjusted using 1 mol·L −1 nitric acid to 5.70 ± 0.33. One liter of treatment solution was applied at each treatment-irrigation event, which resulted in ≈20