Abstract
The weed Adenocalymma peregrinum that is popularly known in Brazil as “ciganinha”, belongs to the family Bignoniaceae. The only way to control this plant species in crop fields is by the application of herbicides on the stump or directly on the stem. The present study aimed to analyze the effect of glycerine in controlling A. peregrinum (MIERS) L.G.Lohmann when applied on the stem. The glycerin used as a spray application of herbicide, underwent pre-purification processes with different concentrations of phosphoric acid (85%) and was characterized for water content, sulphated ash, total glycerol, matter organic non-glycerol (MONG), methanol and pH. For the analysis of the chemical composition of the stem lignin, holocellulose, extractives, calorific value and elementary quantitative determination of C, N, H, S were determined, as well as the total content of oxygen from the stem. The field work was installed at the town of Alvorada-TO, following the randomized complete block design with six treatments and four replications. Results show that the stem of A. peregrinum contains a significant amount of nitrogen, compared to other species, and high lignin content which makes it the most resistant species. The use of glycerin combined to the herbicide (picloram and triclopyr), was not efficient when compared to diesel oil. It was observed that the glycerin has potential as a vehicle for applying herbicides, leaving much to the development of new studies to make changes in its physicalchemical characteristics. Key words : Weeds, pastures, management, Adenocalymma peregrinum.
Highlights
Livestock is one of the most important economic activities in Brazil, accounting for 8.9% of national GDP
The present study aimed to analyze the effect of glycerine in controlling A. peregrinum (MIERS) L.G.Lohmann when applied on the stem
The glycerin used as a spray application of herbicide, underwent pre-purification processes with different concentrations of phosphoric acid (85%) and was characterized for water content, sulphated ash, total glycerol, matter organic non-glycerol (MONG), methanol and pH
Summary
Livestock is one of the most important economic activities in Brazil, accounting for 8.9% of national GDP. According to Harris (2010), degradation of pastures is a major problem in Brazilian cattle. About 70 million hectares of pastures in the Central West and Northern Brazil have been degraded or are undergoing degradation. This occurs due to low soil fertility, inadequate forage, high grazing pressure, and mainly due to high infestation weeds (Feldman and Refi, 2006). A plant species is considered a weed if it is growing in places where it is detrimental to human activities such as interfering with the development of commercial crops or poisoning
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