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Right arrow Weed Management
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Weed Seedbank Dynamics in Three Organic Farming Crop Rotations

John R. Teasdale*, Ruth W. Mangum, Jay Radhakrishnan and Michel A. Cavigelli

USDA-ARS Sustainable Agricultural Systems Lab., Building 001 Room 245, Beltsville, MD 20705



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  		Fig. 1. Smooth pigweed seedbank populations determined in spring for cropping sequences in three organic rotations. Bars represent the standard error of the mean. (A) Two-year rotation included Sequences 1 (closed circle) and 2 (open circle). (B) Three-year rotation included Sequences 3 (closed square), 4 (open diamond), and 5 (open square). (C) Four-year rotation included Sequences 6 (closed triangle), 7 (open triangle), and 8 (inverted triangle). Sequences are described in Table 1.

 


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  		Fig. 2. Common lambsquarters seedbank populations determined in spring for cropping sequences in three organic rotations. Bars represent the standard error of the mean. (A) Two-year rotation included Sequences 1 (closed circle) and 2 (open circle). (B) Three-year rotation included Sequences 3 (closed square), 4 (open diamond), and 5 (open square). (C) Four-year rotation included Sequences 6 (closed triangle), 7 (open triangle), and 8 (inverted triangle). Sequences are described in Table 1.

 


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  		Fig. 3. Annual grass seedbank populations determined in spring for cropping sequences in three organic rotations. Bars represent the standard error of the mean. (A) Two-year rotation included Sequences 1 (closed circle) and 2 (open circle). (B) Three-year rotation included Sequences 3 (closed square), 4 (open diamond), and 5 (open square). (C) Four-year rotation included Sequences 6 (closed triangle), 7 (open triangle), and 8 (inverted triangle). Sequences are described in Table 1.

 




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