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：本研究旨在明确藜豆（velvet bean）对甘蔗品种‘RB855536’宿根的干扰时长，并探明其降低作物产量及收获产物品质的潜力。本试验采用随机区组设计，共设置18个处理，分为两组，每个处理设置4次重复。第一组中，自甘蔗芽萌动起，设置9个不同时长的无藜豆干扰处理：萌动后0~15天、0~30天、0~45天、0~60天、0~90天、0~120天、0~150天、0~180天（萌动后天数，days after budding, DAB），以及萌动至收获全程（0-harvest）；第二组中，甘蔗与藜豆在与第一组对应的各时长中共生生长。甘蔗品种‘RB855536’宿根田中藜豆干扰的临界防控时长为138天，范围为萌动后50天（预干扰期，pre-interference period, PIP）至萌动后188天（杂草干扰全程防控时长，total period of weed interference prevention, TPIP）。藜豆的干扰会使甘蔗产量降低50%，并对收获产物的品质产生负面影响。