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Allelopathic Potential of Bermudagrass and Johnsongrass and Their Interference with Cotton and Corn

^a Technol. and Educ. Inst. of Larissa, Lab. of Weed Sci., Larissa 41110, Greece
^b Technol. and Educ. Inst. of Thessaloniki, Lab. of Crop Sci., Thessaloniki 54101, Greece
^c Lab. of Agron., Aristotle Univ. of Thessaloniki, Thessaloniki 54124, Greece

View larger version (23K): [in a new window]   Fig. 1. Total monthly rainfall and mean monthly temperature during the experiment.

View larger version (28K): [in a new window]   Fig. 2. Inhibitory effect of johnsongrass, bermudagrass, or purple nutsedge extracts on cotton seedling germination, total fresh weight, and root length. Means are averaged over two experiments.

View larger version (22K): [in a new window]   Fig. 3. Inhibitory effect of johnsongrass, bermudagrass, or purple nutsedge extracts on corn seedling germination, total fresh weight, and root length. Means are averaged over two experiments.

View larger version (25K): [in a new window]   Fig. 4. Inhibitory effect of johnsongrass or bermudagrass extracts on barnyardgrass seedling germination, total fresh weight, and root length. Means are averaged over two experiments.

View larger version (29K): [in a new window]   Fig. 5. Inhibitory effect of johnsongrass or bermudagrass extracts on bristly foxtail seedling germination, total fresh weight, and root length. Means are averaged over two experiments.

View larger version (28K): [in a new window]   Fig. 6. Total fresh weight (14 wk after planting) and seed yield of cotton grown with and without bermudagrass or johnsongrass interference.

View larger version (30K): [in a new window]   Fig. 7. Silage yield (14 wk after planting) and grain yield of corn grown with and without bermudagrass or johnsongrass interference.

View larger version (21K): [in a new window]   Fig. 8. Temporal pattern in shoot number of bermudagrass or johnsongrass grown with corn or cotton during the 2002 growing season. Lines describe quadratic regression equations.

View larger version (21K): [in a new window]   Fig. 9. Temporal pattern in shoot number of bermudagrass or johnsongrass grown with corn or cotton during the 2003 growing season. Lines describe quadratic regression equations.

View larger version (23K): [in a new window]   Fig. 10. Temporal pattern in fresh weight of bermudagrass or johnsongrass grown with corn or cotton during the 2002 growing season. Lines describe quadratic regression equations.

View larger version (22K): [in a new window]   Fig. 11. Temporal pattern in fresh weight of bermudagrass or johnsongrass grown with corn or cotton during 2003 growing season. Lines describe quadratic regression equations.