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Planta Daninha

Print version ISSN 0100-8358

Abstract

LACA-BUENDIA, Julio Pedro. Weed control in cotton (Gossypium hirsutum L.) with cyanazine and other herbicides. Planta daninha [online]. 1985, vol.8, n.1-2, pp. 71-80. ISSN 0100-8358.  http://dx.doi.org/10.1590/S0100-83581985000100009.

The objective of this study was to determine the most efficient combination of cyanazine with ot her herbicides as preemergent applications in cotton (Go ss ypium hi rsutum L.). The following treatments were tested: cyanazine + diuron at 0.8 + 0.8 kg i.a/ha and 1.0 + 1.0 kg i.a /ha; cyanazine + oryzalin at 1.2 + 0.8 kg i.a / ha and 1.6 + 1.2 kg i.a/ha; cyanazine + metolachlor at 1.4 + 2.0 kg i.a/ha and 1.75 + 2.52 kg i.a/ha; cyanazine at 1.75 kg i.a/ha ; oryzalin at 1.12 kg i.a/ha; metolachlor at 2.52 kg í.a/ha; diuron at 1.6 kg i.a/ha; unweeded and weed - free checks. Based on visual evaluation according to European Weed Research Council scale, all the herbicides showed good weed control up to 30 days - after application (d.a. a). None of the treatments caused injuries to cotton plants and no significant difference was observed for initial and final stand. Cyanazi ne + metolachlor did not show any significant difference for seed - control yield as compared to weed - fre e check. Plant height, seed index, fiber percent age, lint index and fiber propertie s were not affected by any of the treatments . The cotton boll weight was affected by oryzalin.

Keywords : Herbaceous cotton; Goss ypium hirsutum L.; weed control; herbicide mixtures.

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