Weed Interference in Semi-Erect and Semi-Prostate Cowpea Cultivars

ABSTRACT: This study aimed to determine weed interference periods in semi-erect and semi-prostrate cowpea cultivars. Two simultaneous experiments were conducted with the cowpea cultivars BRS Guariba (semi-erect) and BRS Aracê (semi-prostrate). The experimental design was a randomized block design with four replications in a 7 × 2 factorial scheme, seven periods × two weed management (control and coexistence). Control and coexistence periods consisted of 0, 0-8, 0-16, 0-24, 0-32, 0-45, and 0-60 days after emergence (DAE) for the semi-erect cultivar and 0, 0-8, 0-16, 0-24, 0-32, 0-45, and 0-64 DAE for the semi-prostrate cultivar. Competition throughout the cycle reduced productivity by up to 39.81% for BRS Guariba and 37.27% for BRS Aracê. The cultivars BRS Guariba and BRS Aracê presented critical period of interference prevention of 9 to 41 DAE and 15 to 32 DAE, respectively. The semi-prostrate cultivar BRS Aracê was more competitive with weeds, requiring a shorter control period to express maximum productivity.摘要：本研究旨在明确半直立型与半匍匐型豇豆品种的杂草干扰时期。本研究以半直立型豇豆品种BRS Guariba与半匍匐型豇豆品种BRS Aracê为供试材料，同步开展两项试验。试验采用随机区组设计，设置7×2析因组合（7个杂草管控时期×2种杂草管理模式：杂草防控与杂草共生），共设置4次重复。半直立型品种的杂草防控与共生时期分别为出苗后（days after emergence, DAE）0 d、0~8 d、0~16 d、0~24 d、0~32 d、0~45 d及0~60 d；半匍匐型品种的对应时期则为0 d、0~8 d、0~16 d、0~24 d、0~32 d、0~45 d及0~64 DAE。全生育期杂草竞争可使BRS Guariba的产量最高降低39.81%，使BRS Aracê的产量最高降低37.27%。BRS Guariba与BRS Aracê的杂草干扰防控临界期分别为出苗后9~41 d与15~32 d。半匍匐型品种BRS Aracê与杂草的竞争能力更强，仅需更短的杂草管控时长即可实现最高产量。