Assess your knowledge of effective weed management practices in wheat cultivation, including methods, timing, and common weed species. This quiz covers key strategies to minimize yield loss in wheat fields.
Which of the following is a common broadleaf weed found in wheat fields that significantly affects crop yield?
Explanation: Chenopodium album, also known as lamb's quarters, is a widespread broadleaf weed in wheat fields. Phalaris minor and Avena fatua are grassy weeds, not broadleaf, while Lolium temulentum is another grass weed. Knowing the type of weed present is essential for effective control.
When is the most effective time to apply post-emergence herbicides in wheat for optimum weed control?
Explanation: Applying post-emergence herbicides at the tillering stage targets weeds when they are young and most susceptible, improving control and protecting yield. Applying at sowing, grain filling, or after harvest would generally be ineffective for most weed species.
Which practice can help reduce the intensity of weed infestation in wheat without using chemicals?
Explanation: Crop rotation disrupts weed life cycles and can decrease weed populations over time. Early harvesting and frequent irrigation do not directly manage weeds, while delayed sowing often allows more weeds to establish before wheat is planted.
Which mechanical practice is commonly recommended for managing weeds in wheat before crop emergence?
Explanation: Pre-sowing deep ploughing can help bury weed seeds and disrupt weed emergence. Hand weeding and manual hoeing are post-emergence methods, while stubble burning is mainly for residue management and not a primary weed control tactic.
What is one major consequence of repeated use of the same herbicide group in wheat fields year after year?
Explanation: Repeated use of the same herbicide group selects for resistant weed biotypes, making future control more difficult. The other options do not result from herbicide repetition; resistance is a significant concern for sustainable weed management.