As mentioned earlier, compost enriches soil with nutrients and improves its structure without causing harm when used in moderation.
Well-composted or aged manure from livestock can be beneficial for soil health and fertility, as long as it's applied at appropriate rates to prevent nutrient imbalances.
Planting cover crops like clover, rye, or legumes can improve soil health by adding organic matter, preventing erosion, and fixing nitrogen in the soil.
Organic mulch materials like straw, wood chips, or leaves can help conserve soil moisture, regulate temperature, and prevent weed growth without harming the soil.
Certain plants, like mustard or buckwheat, can be grown as cover crops and then turned into the soil to add organic matter and nutrients without causing harm.
Fallen leaves from trees and shrubs can be left on the soil surface to naturally decompose and enrich the soil.