The objective of this study was to evaluate the emergence of purple nutsedge (Cyperus rotundus), under different amounts of sugar cane straw displaced on the soil surface. The treatments consisted of quantities of straw equivalent to 0, 2, 4, 8, 16 and 20 t ha-1 from the cultivars RB 82 - 5336 and SP 79 - 2233. Control treatment without straw showed the largest number of emerged plants. The treatments with 2, 4 and 8 t ha-1 had a behavior similar to the control, 46 days after planting. The treatments using 16 and 20 t ha-1 of straw provided a smaller number of emerged plants throughout the experiment; however, the treatment with 20 t ha-1 was similar to the control, regarding shoot dry weight. No effect of the amounts of straw was observed on the number of tubers produced. The effects of different sugarcane cultivar straws were similar.
sugarcane straw; purple nutsedge; weed
