___________ is not a limitation of cover or companion crops.

Increased soil erosion is not considered a limitation of cover or companion crops because one of the primary benefits of these practices is their ability to enhance soil structure and health, which can actually reduce soil erosion. Cover crops, for example, help to improve soil stability by increasing organic matter content and root mass, which holds the soil in place. The foliage of these plants can also protect the soil surface from water and wind erosion.

While cover and companion crops may compete with main crops for water and nutrients, lead to additional management costs, or potentially reduce yields in certain circumstances, they are primarily advocated for their ability to prevent erosion and improve overall soil quality. Therefore, the assertion that increased soil erosion is a limitation of these practices is incorrect, as they are fundamentally designed to mitigate such issues.