Controle químico de capim-gengibre (Paspalum Maritimum Trin.) no Estado de Alagoas

Abstract

This study aimed to evaluate the efficiency of herbicide to control pre and post-emergence grass ginger and check the reproductive behavior vegetatively and seed the grass ginger in chemical control in Rio Largo, Alagoas State. Three experiments were conducted in a greenhouse house. In the first trial experiment was carried out in the field in Cuia Velha Farm in the municipality of Rio Largo AL - installed in randomized blocks with four replicates, each replicate consisted of 3 m wide by 6 m long. The herbicide treatments were applied alone or in association, used in late post-emergence. The herbicides used in the treatments were: T1 - metribuzin (200 g ha - 1 ); T2 - metsulfuron-methyl (22 g ha- 1); T3 - glyphosate (1800 g ha - 1 ); T4 - paraquat + diuron (400 g ha - 1 + 100 g ha - 1); T5 - imazapic (123 g ha - 1 ); T6 - MSMA + diuron (200 g ha -1 + 100 g ha- 1); T7 - Witness ( without herbicide ) . Herbicide application was made on the weed species and crop straw, seven days after the mechanization of cane sugar. The variables were percentage of visual control of grass -ginger until 07 to 63 days after herbicide application and dry mass at 30 days. In the second trial three different experiments were conducted in a greenhouse. Chemical control of weeds grass -ginger propagated by seed has been reported. Transplanting plants from rhizomes after planting the rhizomes at 30 days and transplanting plants from rhizomes at 45 days. Treatments were arranged by herbicides: T1 - diuron + hexazinone ( 936 + 264 g ha - 1 ); T2 - isoxaflutole (132 g ha- 1); T3- metsulfuron -methyl (18 g ha- 1); T4 - imazapic ( 123 g ha - 1 ) and T5 - control without herbicide. The experimental design was randomized blocks with split plots in time with five replicates. The experimental units were used vessels with a capacity of 1.0 dm3, with a surface area of 227.5 cm2. The variables were percentage of control grass ginger at 07 and 98 days after application, determination of dry mass on the last day of evaluation and number of tillers-ginger 90 days after application. The results showed a significant difference in the control according to the methods of spread of grass-ginger over time . For the first test with MSMA + diuron , paraquat + diuron , glyphosate and metsulfuron methyl . For the second test the association diuron + hexazinone and metsulfuron were the best for the different propagation methods.