ABSTRACT

Amongst all biotic factors, weeds pose the most serious threat to successful cotton production. Adoption of conservation agriculture, the evolution of herbicide-resistant weed populations, and the absence of any new herbicide chemistry are allowing weeds to become more destructive and uncontrollable. It is important now to investigate cultural practices (non-chemical) to reduce the pressure on herbicides. Trials were conducted at the Gatton Research Farm of University of Queensland during 2015/16 and 2016/17 to assess the implications of narrow row-spacing (50 cm) in managing weeds in glyphosate-tolerant cotton at different weed-infestation intervals [0, 21, 42, 63, 84 and 154 days after planting (DAP)]. Results revealed that narrow (50 cm) row-spacing (at the same density of planting) was not only beneficial in suppressing weed growth (55% lower) and achieving greater lint yield (26% more) but also made the cotton plants more competitive in the early weed-crop interference compared with wide (100 cm) row-spacing. Consequently, the weed-crop competition period (CWIP) was shorter (42 days after emergence) in narrow row-spaced cotton when compared with wide row-spaced cotton (154 days after emergence). The use of this technology will reduce the reliance on herbicides, which in turn will decrease the development of future herbicide-resistant weed populations.

摘要

在所有生物因素中，杂草对成功的棉花生产构成最严重的威胁。保护性农业的采用、抗除草剂杂草种群的进化以及任何新的除草剂化学物质的缺乏使杂草变得更具破坏性和无法控制。现在重要的是调查文化实践（非化学）以减少对除草剂的压力。2015/16 和 2016/17 年期间，在昆士兰大学的 Gatton 研究农场进行了试验，以评估窄行距（50 厘米）在不同杂草侵染间隔下管理耐草甘膦棉花中杂草的影响 [0,种植后 21、42、63、84 和 154 天 (DAP)]。结果表明，窄（50 厘米）行距（在相同的种植密度下）不仅有利于抑制杂草生长（降低 55%）和提高皮棉产量（提高 26%），而且使棉花植株更具竞争力在早期杂草作物干扰与宽（100 cm）行距相比。因此，与宽行距棉花（出苗后 154 天）相比，窄行距棉花的杂草竞争期（CWIP）较短（出苗后 42 天）。使用这项技术将减少对除草剂的依赖，进而减少未来抗除草剂杂草种群的发展。与宽行距棉（出苗后 154 天）相比，窄行距棉的杂草竞争期（CWIP）较短（出苗后 42 天）。使用这项技术将减少对除草剂的依赖，进而减少未来抗除草剂杂草种群的发展。与宽行距棉（出苗后 154 天）相比，窄行距棉的杂草竞争期（CWIP）较短（出苗后 42 天）。使用这项技术将减少对除草剂的依赖，进而减少未来抗除草剂杂草种群的发展。