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Published in Crop Sci 23:868-870 (1983)
© 1983 Crop Science Society of America
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Genotype by Cropping System Interactions in Maize Grown in a Short Season Environment1

J. P. Brakke, C. A. Francis, L. A. Nelson and C. O. Gardner2

Broad adaptation for maize (Zea mays L.) hybrids is a goal of many plant breeders, but limited information is available on genotype by cropping system interactions. We studied the magnitude of this interaction in the western Panhandle region of Nebraska in a short-season, dry environment where at present there is no location specific improvement program. Maize topcrosses were planted in two contrasting cropping systems with two locations per cropping system in 1980. Normal land preparation and irrigation was compared to ecofallow, a zero-tillage cropping system used in the region to minimize water loss due to tillage, reduce production costs, and conserve soil resources. Significant effects of cropping system, location within cropping system, maize genotype, and genotype by cropping system were observed for days to flower, yield, and harvest moisture. The genotype by cropping system interactions in the topcrosses may have been due to differential effects of water level, soil temperature during the early part of the growth cycle, or some combination of these factors. Results suggest that maximum maize yields can be achieved in Nebraska by development of specific cultivars for each cropping system in distinct environments.

Key Words: Tillage • Genotype by environment • Irrigation • Adaptation maize breeding • Cropping system • Zea mays L.

1 Contribution from Dep. of Agronomy, Univ. of Nebraska, Lincoln, NE 68583, and Panhandle Stn., Scottsbluff, NE 69361. Published as paper no. 6681, Journal Series, Nebraska Agric. Exp. Stn. Collaboration through supply of maize seed by Drs. W. Compton (NE), J. Lonnquist (WI), H. Everett (NY), J. Weber (SD), J. Geadelmann (MN), H> Cross (ND), and 22 commercial companies is gratefully acknowledged.

2 Research technician, professor, associate professor, and foundation professor, Dep. of Agronomy.

Received for publication October 7, 1981.




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