Trifluralin Rate Affects Cabbage Stands

in HortScience

Difficulty in obtaining and maintaining an adequate plant stand in directly seeded cabbage led to the investigation of possible causes of plant loss. A series of experiments was conducted evaluating the effect of six rates (0, 0.28, 0.41, 0.56, 0.84, 1.12 kg·ha–1 a.i.) of trifluralin on cabbage stand. The treated area was irrigated immediately after planting; one-half of the area received overhead irrigation and the other half received furrow irrigation. Activated charcoal as a slurry was sprayed at the rate of 336 kg·ha–1 directly into the seed furrow on half the plots receiving the higher trifluralin rates. Plots treated with trifluralin at rates of 0.56, 0.84, and 1.12 kg·ha–1 had lower plant populations if activated charcoal was not applied. Grass, broadleaf, and sedge weed control was as effective with 0.28 and 0.41 kg·ha–1 of trifluralin as it was at the higher rates of 0.56, 0.84, and 1.12 kg·ha–1. Plant population was not affected as much by trifluralin rates when furrow irrigation was used as compared with overhead irrigation. Producers should be careful not to exceed 0.41 kg·ha–1 of trifluralin on cabbage directly seeded into light-textured soils, because reduced stands can be expected.

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