Which organic matter is added to a field to reduce soil erosion caused by water?

Straw mulch is particularly effective at reducing soil erosion caused by water due to its ability to create a protective layer over the soil surface. When applied, straw mulch acts as a barrier against the impact of raindrops, which can dislodge soil particles and lead to erosion. Additionally, it helps retain moisture in the soil and promotes the establishment of beneficial microbes and organisms, further improving soil structure and resilience.

The use of straw mulch also helps improve infiltration rates, allowing water to seep into the soil rather than run off the surface, which is critical in managing erosion. Its decomposing nature gradually contributes organic matter to the soil, enhancing its overall health and fertility over time.

While other organic materials like cover crops, compost, and grass clippings have their own benefits, they serve different primary purposes. Cover crops are typically used to improve soil fertility and structure while also providing erosion control when they are actively growing. Compost enriches the soil with nutrients, aiding plant growth but may not directly address surface erosion as effectively as straw mulch does. Grass clippings can provide some erosion control when used as mulch but may not provide the same level of protection against heavy rainfall as straw mulch does.