In 223 on-farm comparisons, product advancement tests and research trials in 2008-2010 in water-limited environments concentrated in NE, CO, KS and TX and controlled stress evaluations in California and Chile, Optimum® AQUAmax® hybrids were tested against leading commercially available competitor and Pioneer hybrids. Optimum AQUAmax hybrids demonstrated a 5.0 percent average yield advantage over the leading commercial hybrids tested. Water-limited environments are those in which the water supply/demand ratio during flowering or grain fill was less than 0.66 on a 0-1 scale (1 = adequate moisture as determined by Pioneer) using Pioneer's proprietary EnClass® system and in which the average yield of the commercially available hybrids was less than 150 bu/acre. Moisture levels were measured either at trial location or the nearest weather station. Product performance in water-limited environments is variable and depends on many factors such as the severity and timing of moisture deficiency, heat stress, soil type, management practices and environmental stress as well as disease and pest pressures. All hybrids may exhibit reduced yield under water and heat stress. Individual results may vary. |