Análise da emergência e desenvolvimento inicial de Ipomoea grandifolia submetida a diferentes tipos de cobertura vegetal de inverno

Abstract

Among the many problems that plague agricultural production, invasive plants stand out as one of the main challenges to be faced. Due to their high capacity to establish themselves in agricultural areas, for being plants with greater hardiness and high seed production capacity, the harmful plants develop even in the face of climatic adversity and acquire resistance to herbicides. Therefore, the use of ground cover is a practice used to control the population of spontaneous plants, besides contributing to the physical and biological structure of the soil. The object of this study is Ipomoea grandifolia, popularly known as corda-de-viola, which has proven to be one of the most important weeds in crops, especially soybeans. The objective of this work was to evaluate the effects of different types of green manures arranged on the surface, on the germination and emergence of I. grandifolia, seeking to determine the level of suppression of each type of mulch in relation to germination and emergence of cordgrass plants. As a research method, the cultivation of cover crops was conducted and later analyzed by means of bioassays of Rope-of-the-Veed germination, using the Randomized Completely Randomized Designation, with the bioassay of cultivation of I. grandifolia guided in a greenhouse, remaining in pots for 30 days and later submitting the normal seedlings collected for counting, measuring and weighing of dry mass. The results and weighings obtained were submitted to variance analysis and later to the Duncan comparative test. In view of the experiments, it was verified that some mulches show to be more efficient to reduce I. grandifolia, compared to others that favor the development of the corda-de-viola. The results showed that the ryegrass and black oat straws favored the root and aerial development and the production of dry mass of I. grandifolia seedlings, and were not suitable for the control of this weed. The use of turnip rape is recommended as a cover plant to contribute to the control of I. grandifolia in infested areas.