Saccol, A.V. et al. 1993. Competition of barnyardgrass on soybean cultivated in a hydromorphic soil. I. effect on weed dry matter production and soybean grain yield. Pesquisa Agropecuaria Brasileira. 28, 7 (Jul. 1993), 803–812. DOI:https://doi.org/10.1590/S1678-3921.pab1993.v28.3941.