Which of the following is a drawback of repeated foliar micronutrient applications?

Repeated foliar micronutrient applications often require multiple applications to achieve the desired effect on plant health and growth. This need for several applications is a significant drawback as it can increase labor costs and complexity in management practices. Each application requires careful timing, especially since the effectiveness can depend on factors such as weather conditions and the specific needs of the crop during different growth stages.

In contrast, while cost-effectiveness, soil quality enhancement, and increased plant yield can be benefits of micronutrient applications, they do not address the logistical challenge of needing to apply these nutrients multiple times. This requirement not only adds to the operational burden but can also lead to uneven nutrient availability if not managed properly. Thus, the need for multiple applications stands out as a critical consideration when utilizing foliar micronutrient applications in agricultural practices.