Avaliação do desenvolvimento da cultura do sorgo (sorghum bicolor ( l.) moench) sob diferentes lâminas de água e estresse hídrico

In the global agricultural scenario, and especially in Brazil, there is an increasing demand for the development of new technologies to use water resources in a sustainable manner. The experiment was carried out at the Federal Institute of Minas Gerais, on the São João Evangelista Campus. The aim of the work was to evaluate the growth and production of sorghum (Sorghum bicolor [L.] Moench), subjected to different irrigation depths and water stress. Physiological parameters were evaluated: stem height (AC), stem diameter (DC), volume of water consumed by the crop (VA), absolute growth rate (TCA), total dry mass (MST), total wet mass (MUT ), shoot dry matter mass (MSPA), assessments were made at 30, 60, 90 and 120 days after emergence (DAE). The experimental design was in randomized blocks (DBC), with five blocks and four treatments, represented by slides 60%, 80%, 100% and 120%, replacement occurred weekly, using the 100% slide as a reference, measured through the precision scale. Sorghum was planted in polyethylene pots, filled with 12 kg of soil, totaling twenty treatments. Two replacements were carried out during the experiment based on the Maximum Water Retention Capacity (CMRA). The data were subjected to analysis of variance (ANOVA) using the F test (p < 0.05) with the aid of the Sisvar 5.6 program, and the treatment means were subjected to correlation analysis, using the Excel and Libreoffice tools. To quantify the volume of water, linear regression analysis was used using the Excel tool, correlating the variables with the total volume of water consumed. The slides influenced the results, with better productivity in slides of 100% and 120%, despite water stress during the phenological stages.