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Analysis of yield components in maize (Zea mays L.) hybrids across planting dates is limited. Research was conducted in 2013 and 2014 at Mead, Nebraska, United States with the objective to determine the influence of year, hybrid, drought tolerance type, and maturity classification across planting dates on maize yield and yield components. Early-and late-maturity DroughtGard (with CspB transgene) maize hybrids, and a late-maturity non-DroughtGard maize hybrid were planted at three dates in each year. Average maize yields were 10.8 ± 1.3 t/ha in 2013 and 13.6 ± 1.6 t/ha in 2014 with little difference across planting dates. Yield for 109 to 114 CRM (610 to 650 FAO maturity) hybrids was 13 ± 1.9 t/ha compared to 11 ± 1.6 t/ha for 97 to 100 CRM (450 to 480 FAO maturity) hybrids, and similar yields for late DroughtGard and non-DroughtGard hybrids were found. The yield of the early-maturity DroughtGard hybrids was associated most with direct effects of the number of ears per square meter (R = 0.53**) and kernels per ear (R = 0.44**) while the late-maturity DroughtGard hybrids were affected most by the direct effects of ears per square meter (R = 0.54**) and kernel weight (R = 0.57**). Yield components accounted for most yield differences between hybrids with different maturity classifications. Yield component compensation which occurred between DroughtGard and non-DroughtGard hybrids led to similar grain yields across planting dates.

Path analysis of drought tolerant maize hybrid yield and yield components across planting dates