Saleem Rashid, Bajwa Ali, Campbell Shane, Fletcher Mary T, Kalaipandian Sundaravelpandian, Adkins Steve W
School of Agriculture and Food Sustainability, The University of Queensland, Gatton, QLD 4343, Australia.
La Trobe Institute of Sustainable Agriculture and Food (LISAF), Department of Ecological, Plant and Animal Sciences, AgriBio, La Trobe University, Melbourne, VIC 3086, Australia.
Plants (Basel). 2024 Dec 30;14(1):82. doi: 10.3390/plants14010082.
This study assessed the effectiveness of four competitive pasture species-Premier digit grass ( Steud. var. Premier), Rhodes grass ( Kunth.), sabi grass ( Hack.), and buffel grass ( L.) against the toxic annual riceflower ( Lindl.) at varying planting densities and ratios. At six plants pot, with a 66:33 grass-to-weed ratio, riceflower biomass decreased by 73.7%, 82.5%, 73.7%, and 60.6% when grown alongside Premier digit, Rhodes, sabi, and buffel grasses, respectively. Similarly, with four plants pot at a 75:25 ratio, reductions were 69.1%, 79.8%, 71.0%, and 44.5%, respectively. Annual riceflower experienced the greatest suppression when grown with Rhodes grass, showing aggressivity index (AI) values of -60.2 and -67.2 and relative crowding coefficient (RCC) values of 0.4 for both six and four plants pot. Premier digit grass also suppressed riceflower effectively, with riceflower AI values of -35.6 and -36.7 and RCC values of 0.5 and 0.6. Buffel grass had the least impact, with riceflower AI values of -41.1 and -27.9 and RCC values of 0.9 and 2.0. Sabi grass also demonstrated good suppressive effects, though slightly less than the top two species. Higher planting densities generally resulted in stronger riceflower suppression. The results highlight the importance of considering planting density, arrangement, and key plant traits when selecting pasture species for successful weed control. Based on these findings, we conclude that Premier digit grass and Rhodes grass show promising potential for effective suppression of annual riceflower growth.
本研究评估了四种竞争性牧草品种——超级狗尾草（Steud. var. Premier）、罗得草（Kunth.）、萨比草（Hack.）和水牛草（L.）在不同种植密度和比例下对有毒一年生稻花（Lindl.）的防除效果。在每盆种植6株、草与杂草比例为66:33的情况下，与超级狗尾草、罗得草、萨比草和水牛草混种时，稻花生物量分别减少了73.7%、82.5%、73.7%和60.6%。同样，在每盆种植4株、比例为75:25的情况下，减少率分别为69.1%、79.8%、71.0%和44.5%。一年生稻花与罗得草混种时受到的抑制最大，在每盆6株和4株的情况下，其竞争 aggressivity index (AI) 值分别为 -60.2 和 -67.2，相对拥挤系数 (RCC) 值均为0.4。超级狗尾草也能有效抑制稻花生长，稻花AI值为 -35.6 和 -36.7，RCC值为0.5和0.6。水牛草的影响最小，稻花AI值为 -41.1 和 -27.9，RCC值为0.9和2.0。萨比草也表现出良好的抑制效果，尽管略低于前两个品种。较高的种植密度通常会导致对稻花更强的抑制作用。结果强调了在选择牧草品种以成功控制杂草时，考虑种植密度、布局和关键植物性状的重要性。基于这些发现，我们得出结论，超级狗尾草和罗得草在有效抑制一年生稻花生长方面显示出有前景的潜力。
