This is why cover crops are used among your main crop plants to hold the soil in place with their roots.
soil is washed away only where there are no roots holding it in place.
besides, these crops can provide other benefits like fixing Nitrogen for example for your main crop to use (Vicia to name one).
in extreme cases of erosion, Vetiver grass is used to hold soils in place (mainly in slopes, but not limited to). Vetiver features a wide and deep root systems that creates a solid foundation.
good luck.