Which is NOT a way to improve efficiency in hard ground conditions?

Using the smallest possible bucket is not a way to improve efficiency in hard ground conditions. When working in tough, compacted terrains, a larger bucket can actually enhance performance by allowing the operator to move more material with each pass. A smaller bucket may require more trips to complete the same amount of work, which can lead to increased operational time and reduce overall efficiency.

In contrast, lowering the bucket angle can help ensure that the bucket engages the surface more effectively, allowing for better penetration and lifting of materials. Making long, scraping passes can also facilitate the movement of more material in a single motion, which is beneficial in hard ground conditions. These techniques are aimed at maximizing the working capability and reducing the number of cycles needed to complete a task, thereby improving productivity.