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Water availabity and development of sorghum plants (Sorghum bicolor (L.) Moench.) and Brachiaria (Brachiaria brizantha (A. Rich) Stapf cv. Marandu) associated. The acknowledgement of the pluviometric offer and the variation of water in the soil are preponderant factors for the efficient handling and the success of the croplivestock integration system Therefore, the present work has evaluated the productivity and development of sorghum plants AG-1018 and Brachiaria brizantha cv. Marandu associated, under periods of water stress. The trial was conducted under experimental design in random blocks with four different treatments and three repetitions. The treatments are referred to the interruption of irrigation in critical periods for the development of the cultures (T1 – test, irrigation over the entire cycle; T2 – interruption starting at B. brizantha germination; T3 interruption starting at B. brizantha tillering and beginning of panicle formation of sorghum; and T4 – interruption at the beginning of sorghum blooming). In all kinds of treatment, the irrigation interruption was kept until the humidity in the 0-2ft soil layer reached values around the permanent wilting point (PWP). The variables studied for both species were: plant height, shoot biomass productivity, leaf area index (LAI). Only for Brachiaria brizantha cv. Marandu the number tillers was assessed. As for sorghum plant, the grain production was evaluated. The variables were submitted to static analysis, with variance analysis (test F) and Tukey test for average comparisons. Although there is no difference in the biomass of shoots of B. brizantha cv. marandu the end of the experiment, the stress caused by water deficit in late tillering and early development of plants. The period of water restriction in the panicle initiation or flowering sorghum grown in consortium with B. brizantha cv. marandu determined reduction in grain yield of the crop. The planting of sorghum and intercropped B. brizantha cv. marandu must planned so that the germination of B. brizantha cv. marandu and initiation of panicle and flowering sorghum do not coincide with periods of water restriction.

Disponibilidade de água e desenvolvimento de plantas de sorgo (Sorghum bicolor (L.) Moench.) e braquiária (Brachiaria brizantha (A. Rich) Stapf cv. Marandu) consorciadas