Paspalum virgatum: avaliação de matéria seca, comprimento de plantas e seletividade de herbicidas

Abstract

The national production of beef is characterized by the herd created a pasture. In areas where there is no direction there is a dispute between forages and weeds. In these areas we can highlight the following species: Andean grasshopper (Andropogom bicornisL.) and razor-blade grass (Paspalum virgatum L.), among others. The ingredients required for application in pastures and editions are for the control of broad leaves. The morphological, anatomical and physiological characteristics may lead to the development of a selectivity to herbicides, cultivars of the genus Brachiaria. As a result of this, it is considered to evaluate Paspalum virgatum control with different fundamental principles of herbicides evaluating dry matter production; to evaluate a phytoxicity and dry matter production of the adult Paspalum plant that survive the treatment. The experiment was carried out at the Experimental Station of the Federal Technological University of Paraná, Campus Dois Vizinhos, from September 2018 to December 2018. The experimental design was to be used in a randomized block design, with four replications for the competition between plants and projects. The obtained data are submitted to analysis of variance by the F test, when significant by Tukey test at 5% probability of error (p ≤0.05). Experiment with chemical control there will be the planting of Paspalum virgatum in pots 0,5 L with a plant of Brachiaria and Panicum. An application Imazethapyr (106 g i.a /ha), Metsulfuron-Methyl (8 g i.a /ha), Nicosulfuron (40 g i.a /ha), Diclosulam (41,7 g i.a /ha) e Atrazine (4 kg i.a /ha). The herbicides are sprayed. The obtained results are submitted to analysis of variance by the F test, when significant by Tukey test at 5% probability of error (p ≤0.05).