The present work aimed to determine the period prior to interference and the total prevention period to interference of weeds in sugarcane (ratoon) cultivar SP 80-3280. The experiment was carried out on a Dark Red Oxisol. The treatments consisted of increasing periods of presence or absence of weeds: 0, 0-15, 0-34, 0-59. 0-90, 0-124,0-157, 0-269 days (sugarcane harvest). The most common weeds found in the experimental area were Panicum maximum,Acanthospermum hispidum and Altemanthera tenella. The results obtained, admitting 2% and 5% reduction in sugarcane productivity, showed that the period prior to interference tolerated by the culture was 9 and 18 days after ratoon sprout (DAS) and the total prevention period to interference was 200 and 137 DAS, respectively, resulting in a critical period of prevention to interference from 9 days at 200 DAS of 2% reduction, to 18 days at 137 DAS, of 5% reduction.
control periods; competition; interference; Saccharum spp
