Evaluation of herbicides in pineapple (Ananas comosus L.) var. MD2 for weed control in red ferralitic soils
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Abstract
The selectivity of the MD2 pineapple variety and the effectiveness on weeds of the herbicides Hexaron 60 GD (diuron + hexasinona) at (0.12, 0.24 and 0.48) kg • ia • ha-1, S were evaluated -metolachlor 96 CS at (1.92, 2.88 and 3.84) kg • ia • ha-1, pendimentalin 33 CS at (0.66, 0.99 and 1.32) kg • ia • ha-1 and oxyfluorfen CE 24 at (0.24, 0.36 and 0.48) kg • ia • ha-1, in the experimental phase and the mixtures of S-metolachlor + oxyfluorfen at (1.92 + 0.48) kg • ia • ha-1, pendimentalin + oxyfluorophen at (0.99 + 0.48) kg • ia • ha-1 in extensive phase, both experiments were carried out on red ferralitic soil in the province of Ciego de Ávila, as results it was obtained that the effectiveness of the treatments of pendimentalin 33 CS (0.99-1.32) at kg • ia • ha-1, metolachlor 96 CS at (2.88-3.84) kg • ia ha-1, oxyfluorfen 24 CS at (0.36-0.48) kg • ia. ha-1 and Hexaron 60 GD [diuron + hexasinona at (0.18-0.24) kg • ia • ha-1) were significantly superior to the standard in the monocot control. For dicots there was only significant difference with Hexaron 60 GD, (diuron + hexasinona) at 0.24 kg • ha-1 and the standard diuron + ametrina (80 + 80) PH at (3.2 + 2.4) kg • ia • ha-1 with slightly better results than the previous ones. Such applications did not produce significant difference between treatments and the development parameters of the crop, as well as no effect of phytotoxicity in the plants. The extension results showed that the best effectiveness was obtained with the mixtures of pendimentalin + oxyfluorfen (0.99 + 0.48) kg • ia • ha-1 with 84 %, followed by metolachlor + oxyfluorfen (1.92 + 0.48) kg • ia • ha-1 with 82.6%, both applied 20-30 days after the residual ixosaflutole 0.0864 kg • ia • ha-1 and compared with the standard (diuron + ametrina (3.2 + 2.4) kg • ia • ha-1).
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