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The Effect of Time of Seeding on Growth and Development of Rough Pigweed and Yellow Foxtail

  • Jonas Vengris (a1)

Abstract

Rough pigweed (Amaranthus retroflexus L.) on the average emerged 2 days earlier than yellow foxtail (Setaria glauca (L.) Beauv.) The heading and maturity of both weeds seeded in corn was delayed for 3–4 days. The interval between emergence and maturity decreased progressively as seeding dates were delayed. The tallest plants and the highest yields were produced from the early spring seedings. Competition from corn depressed yields of both weeds more than their heights. Height and yield of foxtail seeded during July were most affected. In later seedings foxtail tolerated corn competition much better than pigweed.

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References

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1. Anonymous. 1961. Plant light-growth discoveries. From photoperiodism to phytochrome. ARS Special Report. Agr. Research Service. USDA.
2. Collins, H. A., and Ilnicki, R. D. 1962. Effects of weeds on yield and growth characteristics of field corn grown at different nitrogen levels. Proc. NEWCC 16:329331.
3. Moolani, Moti Kundandas, and Slife, F. W. 1960. The competitive effects of various intensities of pigweed on the development of corn and soybeans. Proc. NCWCC 17:2627.
4. Peters, Robert A., and Yocum, Harlan C. 1961. Progress report on a study of the germination and growth of yellow foxtail (Setaria glauca (L.) Beauv.) Proc. NEWCC 15:350355.
5. Santelmann, P. W., and Meade, J. A. 1961. Variation in morphological characteristics and dalapon susceptibility within the species Setaria lutescens and S. Faberii . Weeds 9:406410.

The Effect of Time of Seeding on Growth and Development of Rough Pigweed and Yellow Foxtail

  • Jonas Vengris (a1)

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