Qualidade de água e períodos de armazenamento de calda herbicida para dessecação

Abstract

Studies related to herbicide application technology can generate information that contributes to saving the financial resources associated with good agricultural practices. The quality of the water and its physico-chemical characteristics are important factors to consider, since their quality has a direct impact on the efficiency of phytosanitary products. Thus, the objective of the study was to study the influence of the storage time of the syrup, carried out at three collection points in the municipality of Jataí - GO, on the efficacy of the glyphosate herbicide on the desiccation of sugarcane. The waters were collected in two years, but in the same season (2017 and 2018) and in the same places. All the water samples were submitted to the physical-chemical analysis, the levels of alkalinity, chloride and iron content, electrical conductivity, pH and hardness of the samples were evaluated. For the field experiment, the experimental design was a randomized block design in a 3 x 4 x 4 factorial scheme with an additional plot (control), and five replications. The first factor is composed of the water collected at the three-catchment points adopted by the Raízen Plant. The second factor was composed of four storage periods (12, 8, 4.0 days) and the third factor was composed of the different evaluation dates (15, 30, 45 and 60 days after application). Data were submitted to analysis of variance, and when necessary followed by comparison of means by the Tukey test at 5%. From the results obtained it is concluded that the water collected at the three catchment points have different physico-chemical characteristics. In both experiments it was observed that the control efficiency of sugarcane rats was little influenced by the storage periods of glyphosate herbicide syrups and that, the waters from the 3 capture points also had little or no influence on the effectiveness of control of sugarcane clumps.