Izvorni znanstveni članak
https://doi.org/10.5513/JCEA01/20.1.2106
Path analysis of drought tolerant maize hybrid yield and yield components across planting dates
Steve Mason
; Department of Agronomy and Horticulture, University of Nebraska, Lincoln, Nebraska, USA
Zaher Kmail
; Department of Statistics, University of Nebraska, Lincoln, Nebraska, USA
Tomie Galusha
; Department of Agronomy and Horticulture, University of Nebraska, Lincoln, Nebraska, USA
Željko Jukić
; University of Zagreb, Faculty of Agriculture, Department of Field Crops, Forage and Grassland, Zagreb, Croatia
Sažetak
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 earlymaturity 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 latematurity 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.
Ključne riječi
maize; path analysis; yield; yield components
Hrčak ID:
218110
URI
Datum izdavanja:
19.3.2019.
Posjeta: 1.354 *