Challenge your understanding of effective weed management practices in wheat cultivation. Learn about methods, timing, and the impact of weeds on crop productivity.
Which of the following is a common broadleaf weed found in wheat fields that can significantly reduce yield if not controlled?
Explanation: Chenopodium album, also known as lamb's quarters, is a widespread broadleaf weed in wheat. Phalaris minor and Avena fatua are both grassy weeds, while Echinochloa crus-galli (barnyard grass) is mainly an issue in rice or other summer crops. Proper identification is crucial for effective management.
During which stage of wheat growth is weed competition most detrimental to yield and should be controlled?
Explanation: The tillering stage is when wheat is highly sensitive to weed competition, impacting tiller formation and yield. The hard dough and maturity stages are late in the crop lifecycle, so weed competition by then has less effect. The harvest stage is too late for weed management to influence yield.
What is the main advantage of using pre-emergence herbicides in wheat cultivation?
Explanation: Pre-emergence herbicides target weed seeds and seedlings before they emerge, minimizing competition with the wheat crop early on. They do not control already established weeds, nor do they directly affect wheat seed germination or grain color.
How does rotating wheat with a legume crop help manage weed populations?
Explanation: Crop rotation disrupts the life cycles of weeds adapted to wheat, lowering their prevalence. It does not encourage resistance or increase the seed bank, and legumes typically enhance soil fertility rather than reduce it.
Why is manual or mechanical weeding sometimes recommended as part of an integrated weed management strategy in wheat?
Explanation: Manual weeding reduces reliance on herbicides, thereby slowing the development of herbicide-resistant weeds. It does not directly prevent disease, increase pests, or affect rainfall.