Many birds use an experimental intercropping system, but have very low nesting success on two farms in Iowa, USA

  • Published source details Stallman H.R. & Best L.B. (1996) Bird use of an experimental strip intercropping system in northeast Iowa. The Journal of Wildlife Management, 60, 354-362


This study is summarised as evidence for the following.

Action Category

Plant more than one crop per field (intercropping)

Action Link
Bird Conservation
  1. Plant more than one crop per field (intercropping)

    A study on two arable farms in Iowa, USA, in May-August 1992-3 (Stallman & Best 1996), found that 35 bird species used fields under an experimental intercropping system, with an average of 108 birds/count/100 ha. Three native species (red-winged blackbird Agelaius phoeniceus, common grackle Quiscalus quiscula and vesper sparrow Pooecetes gramineus) nested in the fields, but that only one nest of forty (2.5%) successfully fledged young. Destruction by farming activities was the largest cause of nest mortality (39%) followed by predation (29%). Desertion only occurred at 5% of nests. Strips were 4.6 m wide and contained corn, soybeans and oats as well as mammoth red clover Trifolium pratense.


Output references

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