Interference periods of velvet bean in sugarcane

ABSTRACT: The objective of the present study was to determine the periods of interference of velvet bean on ratoons of sugarcane cultivar 'RB855536' and to identify its potential for decreasing the crop yield and the quality of the harvested product. The experiment was arranged in a randomized block design, with 18 treatments divided into two groups and four replicates per treatment. In the first group, the sugarcane was kept free from velvet bean interference for nine different periods, beginning at bud sprouting: 0-15, 0-30, 0-45, 0-60, 0-90, 0-120, 0-150, and 0-180 days after budding (DAB) and 0-harvest. In the second group, sugarcane was grown in coexistence with velvet bean during the same periods described for the first group. The critical period of interference prevention for velvet bean in ratoons of sugarcane cv. 'RB 855536' lasted 138 days, from 50 DAB (pre-interference period [PIP]) to188 DAB (total period of weed interference prevention [TPIP]). Velvet bean interference caused a 50% decrease in sugarcane yield and negatively affected the quality of the harvested product.

摘要：本研究旨在明确绒豆（velvet bean）对甘蔗品种‘RB855536’宿根蔗的干扰时长，并探明其对作物产量及收获产品品质的降低潜力。试验采用随机区组设计，共设置18个处理，分为2组，每个处理设置4次重复。第一组中，自芽萌发期起，设置9个不同时长的无绒豆干扰处理：芽萌后天数（days after budding, DAB）0~15 d、0~30 d、0~45 d、0~60 d、0~90 d、0~120 d、0~150 d、0~180 d，以及从萌芽至收获全程的无干扰处理。第二组中，甘蔗与绒豆在与第一组相同的时长范围内共存生长。甘蔗品种‘RB855536’宿根蔗的绒豆干扰临界防控期为138 d，即从芽萌后50 d的预干扰期（pre-interference period, PIP）至芽萌后188 d的杂草干扰总防控期（total period of weed interference prevention, TPIP）。绒豆的干扰会导致甘蔗产量降低50%，并对收获产品的品质产生负面影响。