What slope percentage is considered very severe limitations in land capability class?

In land capability classification, slope percentage plays a crucial role in determining the potential limitations for agricultural use. A slope percentage of 18-30% is classified as having very severe limitations for a few key reasons.

Firstly, steeper slopes, such as those within this range, can lead to increased erosion risk. Soil erosion is exacerbated by both surface runoff and gravity, which can wash away topsoil and degrade soil quality. This significantly impacts fertility and the ability to grow crops effectively. Secondly, managing agricultural operations on steeper slopes becomes increasingly challenging due to difficulties in equipment maneuverability and increased labor requirements.

Additionally, the presence of very severe limitations indicates a higher likelihood of issues related to water movement, such as runoff rather than infiltration. This can contribute to poorer water retention in the soil, impacting plant growth.

In contrast, slopes less than 18% are generally considered to have moderate or less severe limitations and are often more manageable for agricultural practices. Therefore, the classification of 18-30% slope as very severe limitations in land capability class highlights the importance of slope in determining land use and management practices.