Morphology and yield response to weed pressure by corn hybrids differing in canopy architecture

Recently, corn ( Zea mays L.) hybrids accumulating more leaf area above the ear, maturing earlier, yielding better in narrower row spacings and tolerating higher population densities than conventional hybrids have been developed. However, no research has been conducted to assess their ability to com...

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Bibliographic Details
Published in:European journal of agronomy 2001, Vol.14 (4), p.293-302
Main Authors: Begna, S.H., Hamilton, R.I., Dwyer, L.M., Stewart, D.W., Cloutier, D., Assemat, L., Foroutan-pour, K., Smith, D.L.
Format: Article
Language:English
Subjects:
Agricultural sciences
Agronomy. Soil science and plant productions
Biological and medical sciences
Corn
Fundamental and applied biological sciences. Psychology
Genetics and breeding of economic plants
Grain yield and weed tolerance
Life Sciences
Pest resistance
Varietal selection. Specialized plant breeding, plant breeding aims
Weeds
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Summary:Recently, corn ( Zea mays L.) hybrids accumulating more leaf area above the ear, maturing earlier, yielding better in narrower row spacings and tolerating higher population densities than conventional hybrids have been developed. However, no research has been conducted to assess their ability to compete with weeds. The objective of this study was to quantify morphological and grain yield responses of hybrids with differing canopy architectures to the presence and absence of weeds. Field experiments were conducted in 1996, 1997, and 1998 at Ste. Anne de Bellevue, Quebec and in 1996 at Ottawa, Ontario. Three hybrids, leafy reduced-stature (LRS), late maturing big leaf (LMBL), and conventional Pioneer 3979 (P3979), were evaluated at two population densities (normal and high), row spacings (38 and 76 cm) and weed pressure levels (weed-free and weedy). Weed pressure reduced the plant height of LRS less (only 4 cm) than the tall hybrids (average reduction of 26 cm). The overall grain yield of the LMBL hybrid was much greater (12.7 mg ha −1) than the LRS (9.6 mg ha −1) and P3979 (11.0 mg ha −1) hybrids in the absence, but not in the presence (LRS, 6.5; LMBL, 6.7; and P3979, 6.8 mg ha −1), of weeds. The yield of early-maturing LRS and P3979 (especially LRS) hybrids, were least affected by weed pressure, suggesting better tolerance of, and competition with, weeds. However, further research with more LRS hybrids is needed, as is the development of better yielding LRS hybrids, before they can be recommended over conventional hybrids.
ISSN:1161-0301
1873-7331
DOI:10.1016/S1161-0301(01)00092-2