Which method is NOT recommended to reduce the likelihood of grain shifting?

Leaving cargo holds partly filled is not recommended as a method to reduce the likelihood of grain shifting. When cargo holds are only partially filled, it creates voids or empty spaces that allow grain to move freely within the hold. This movement can lead to shifting, which adversely affects the stability of the vessel, especially in rough seas. Properly filled cargo holds, on the other hand, allow for better distribution and support of the grain during transit.

In contrast, methods such as saucering, bundling in bulk, and trimming all grain surfaces level actively promote the stability of the grain cargo. Saucering involves shaping the top of the grain in a way that helps hold it in place. Bundling in bulk helps to minimize the space in which the grain can shift. Trimming grain surfaces level ensures a stable load that balances the weights evenly across the hold, significantly reducing the potential for shifting.