Explain weed control efficiency (WCE). Work out WCE from the given data and offer your critical comment :
Weed Control Efficiency (WCE) reflects the percentage reduction in weed population due to a control measure compared with an untreated check. It is calculated as:
$[WCE(\%) = \frac{W_c - W_t}{W_c} \times 100]$
Here, Wc = 90 weeds/m². For hand weeding (Wt = 55), WCE is 38.89%. For herbicide A (Wt = 45), WCE is 50%. For herbicide B (Wt = 40), WCE is 55.56%. For herbicide C (Wt = 50), WCE is 44.44%.
Thus, herbicide B proved the most effective, while hand weeding showed the least efficiency. This highlights the role of modern herbicides in reducing weed population significantly compared to traditional methods. However, continuous reliance on chemicals may cause ecological and resistance issues. Hence, integrated weed management combining herbicides with manual and cultural practices is advisable for sustainable agriculture.
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