Concern about the environmental impacts of agricultural activities has taken on a large dimension, especially in the last decade. These impacts are expressed, for example, in reduction of biological diversity, erosion and contamination of soils, silting and contamination of water springs, increase of agrochemical residues in food, among others. However, the incorporation of the concept of sustainability has led agricultural research in the growing search for alternative and sustainable models of agricultural production and also in the development of techniques capable of reducing the amount of agrochemicals used in the field. Within this perspective, agroforestry systems (ILPF) have contributed to minimize the effects caused by traditional agriculture. In such methodology, crops as diverse as grains, fibers, wood, meat, milk or agroenergy species are intercropped, in rotation or succession, involving the planting of grains, pastures and associated forest crops. This project aimed to evaluate herbicide selectivity and weed control in forest species and annual crops, as well as the temporary inhibition of Brachiaria ruziziensis growth and the supply of boron the plants when boron was applied together with herbicide. Experiments to evaluate herbicide selectivity, weed control and temporary inhibition of B. ruziziensis growth were established in plantations of three forest species (eucalyptus, cedar and mahogany) in order to avoid the competition of these species with the forest component and make possible a subsequent pasture recovery. In addition, herbicide selectivity, weed control and temporary growth inhibition of B. ruziziensis in sorghum and pearl millet crops were evaluated in order to avoid interference of weeds and brachiaria with these crops and to allow pasture recovery. The effect of combining herbicide with boron was also evaluated in order to control weeds and at the same time provide boron to the species used in the intercropping. The results of the project allowed the identification of selective herbicides which, used in a rational way and in smaller doses, can control the weed species, avoid the competition of the forage in the initial phase of the establishment of the crops and allow the recovery of the pasture. The methodology also allowed controlling the weeds and providing boron to the species of the intercropping in a single operation. From the economic point of view, the actions have great potential in contributing to reductions of production costs, increases in the yield of wood, grains and fodder. In the social aspect, it is expected to generate more direct and indirect jobs and greater development of the rural sector. In the environmental aspect, it is expected to improve soil characteristics, reduce the amount of inputs and, mainly, the amount of herbicides used.