EFICÁCIA E SELETIVIDADE DO HERBICIDA SIP 935 NO CONTROLE DE PLANTAS DANINHAS NA CULTURA DO ALGODÃO

Abstract

The cotton as all the cultivated plants, it suffers competition with the harmful plants for water, it shines, nutritious and other. Therefore we have to control those undesirable plants, because they interfere a lot in the development of the implanted culture. With that, the intention of that work was to verify the efficiency of the herbicides exactly in the control of the harmful plants, and the selectivity of these the culture of the cotton. The experiment was driven in an area of Experimental Finance of University "Dr. Francisco Maeda", located in the municipal district of Ituverava, SP, using the variety SS 9815 (Fabrika), and the sowing was made on the 06/02/2007 with spacing of 0,90m implied sense. In the preparation of the area the conventional system was adhered, being made an aração, and soon after, two gradagens. In the planting manuring 250 kg/ha of 04-14-08, was applied like this, the treatments were different from the such form, four growing doses of SIP 935, starting with a dose of 1250g p.c. /ha, later one of 1500g p.c. /há, another one of 1750g p.c. /há and last of 2000g p.c. /há, a treatment standard with S-metolacloro (Dual Gold) in the dose of 1500g p.c. /há, one testifies in clean and the other witness without control. The application of the herbicide was made with a costal pulverizer to the constant pressure (CO2) composed of a bar with 4 beaks XR11002, these regulated with 3,8 pressure bar to distribute 200L/ha of syrup, being the application done in pré-emergency of the harmful plants, reminding that the cotton plants were with four leaves on average, expanded. The portions had as dimensions 3,6m of width and 5m of length, and they were submitted entirely to the installation in the casualizado delineation (DBC) with four repetitions each treatment. The control of harmful plants was evaluated to the 15, 26, 68 Dias After the Application (DAA), considering the control through visual evaluations with a witness to the side, it was also evaluated the number of us and the height of five plants by portion to 114 DAA. After the application, the experimental data were analyzed estatisticamente by the test F for analysis of the variance and to the test of Tukey for comparison of the averages. Finally, the formulation SIP 935 was efficient in the control of the harmful plants, mainly to 68 DAA, and it presented good selectivity to the culture of the cotton, independently of the used dose.