Germinação e emergência de Ambrosia artemisiifolia L. em diferentes palhadas de adubos verdes de inverno

Abstract

The use of the no-tillage system has spread throughout Brazil, providing improvements in the physical, chemical and biological structure of the soil. The use of sowing under the straw of predecessor cultures has benefits in the control of spontaneous plant species, through suppression, depletion or allelopathy. Cultural management of spontaneous plants prevents the development of species resistant to herbicides, a chemical method widely used in conventional cultivation. Based on this reality, the present study sought to suppress the spontaneous plant Ambrosia artemisiifolia (cravorana) with the use of green manure straws of white oat, rye, buckwheat and blue lupine, as well as the mix of these straws. A positive result was obtained regarding the suppression of carnation by means of rye straw and the mix of rye + blue lupine. The development of the A. artemisiifolia species was favored by buckwheat straw, and there was also a greater accumulation of dry mass in the white oat treatment. However, an efficient cultural management for spontaneous species, especially A. artemisiifolia, is highlighted, since the cultivation of green manures in the complex of the no-tillage system is a practice of suppressing the germination or development of unwanted species.