Uso do extrato aquoso de Mucuna preta (Stizolobium aterrimum) como estratégia de manejo para a tiririca (Cyperus rotundus)

Abstract

Sedge (Cyperus rotundus) is one of the main spontaneous herbs in the world's cultivation areas, due to its rusticity, rapid multiplication and difficult control, even through the use of herbicides, which can harm both the health of farmers and also cause damage. to the environment and based on this, the development and use of alternative technologies to carry out this management has become increasingly necessary. Therefore, one option has been the use of allelopathy, substances released by other plants, such as green fertilizers. Therefore, the objective of this work was to evaluate the effect of different dosages of the aqueous extract of black velvet leaves (Stzolobium aterrimum) on the control of nutsedge, searching for an alternative form that inhibits its development. The experiment was installed and conducted at the Seedling Nursery of the Federal Institute of Education, Science and Technology of Rio Grande do Norte (IFRN – Campus Ipanguaçu). The experimental design was entirely randomized, with 5 replications and 5 treatments. The concentrations used were: 0%, 25%, 50%, 75%, 100% applied to pots with substrate, where each pot contained 10 bulbs. The characteristics evaluated were: percentage of live plants, number of bulbs and dry matter of the plants, with the dry matter being obtained using a forced air circulation oven at a temperature of 70º C for 72h. The data on the variables obtained were subjected to regression analysis, and the adjustment of the response curve was carried out with the help of the AgroEstat program. The inhibitory effect of the aqueous extract of mucuna preta on nutsedge was observed, opening possibilities for new studies.