Efeito do uso de herbicidas nas características físicas das sementes de arroz vermelho

Abstract

In the northeastern semi-arid region, red rice is considered to be one of the main components in its diet, with Paraíba being the largest red rice producing state in Brazil and where it is still known as "rice from the earth", and its production is concentrated in the regions of the Valley Of Piancó and Vale do Rio do Peixe. The objective of this work was to evaluate the effect of herbicide use on the physical characteristics of red rice seeds. Two herbicides, DMA and Herbadox, were used with the respective active ingredients: 2,4-D acid and pendimethalin. The experiment was carried out under field conditions at the Department of Plant Science and Environmental Sciences of the Center of Agricultural Sciences (CCA), Campus II, Federal University of Paraíba (UFPB), located in the city of Areia - PB, which was divided into 4 blocks, spaced in 1 m, each containing 10 plots (10 treatments) of 4.0 mx 4.0 m. 150 seeds per linear meter spaced at 0.5 m were sown. The treatments were arranged in applications of different isolated and associated doses of the described herbicides and a treatment without chemical control (control). The effect of herbicide use on the physical characteristics of red rice seeds (moisture content, percentage of pure seeds and the weight of one thousand seeds) was evaluated. The rice-red crop was cultivated under no-till conditions and no fertilization was used. The results were submitted to analysis of variance and compared by the Scott-Knott 5% probability test using the Sisvar software. It was concluded that the variables degree of humidity and percentage of pure seeds did not differ significantly when exposed to the effects of the herbicides used, except for the variable weight of a thousand seeds, where the treatment T6- 2,4D - 1,25 L / There was evidenced with the present work the rusticity and tolerance of the red rice before its exposure to different types of treatments with the herbicides Pendimethalin and 2,4D, where the effects of the respective herbicides did not influence in the majority of the physical characteristics of the seeds of Red rice and also that more recent studies can give us a better understanding and understanding of the subject in question ensuring the results obtained in the present work.