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Crop Science Abstract -

Addition Series Approach to Assessing Competition in a Small Grain-Alfalfa Companion Crop Community


This article in CS

  1. Vol. 30 No. 5, p. 1139-1141
    Received: Nov 24, 1989

    * Corresponding author(s):
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  1. S. E. Nickel,
  2. S. R. Simmons ,
  3. C. C. Sheaffer and
  4. S. R. Radosevich
  1. Dep. of Forest Science, Oregon State Univ., Corvallis, OR 97331



Assessment of competitive interactions within plant communities is a goal for many crop ecologists and agronomists. In the addition series approach, multivariate response models quantify intraspecific and interspecific competition in plant communities. Our objective was to test this approach in a small grain-alfalfa (Medicago sativa L.) companion intercrop, a common forage-establishment system in North America. Experiments were conducted on a Waukegan silt loam soil, with two oat (Avena sativa L.) and two barley (Hordeum vulgare L.) genotypes as companion crops for alfalfa establishment. Alfalfa and small-grain herbage was harvested at boot and soft-dough stages of small-grain development. Multiple regression of log dry mass per plant against plant densities indicated a large competitive influence of the small grain on itself and on the alfalfa. Competition from alfalfa was negligible. Oat plants were less competitive than barley, and dwarf-statured genotypes were less competitive than conventional genotypes. The addition series is well suited to research applications involving agronomic systems.

Contribution of the Agronomy and Plant Genetics Dep., Univ. of Minnesota, Minnesota Agric. Exp. Stn. Journal Series Paper no. 17158.

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Copyright © 1990. Crop Science Society of America, Inc.Copyright © 1990 by the Crop Science Society of America, Inc.