 Organic farming can build up soil organic matter better than conventional no-till farming, which suggests long-term yield benefits from organic farming.An 18-year study of organic methods on nutrient-depleted soil concluded that conventional methods were superior for soil fertility and yield for nutrient-depleted soils in cold-temperate climates, arguing that much of the benefit from organic farming derives from imported materials that could not be regarded as self-sustaining.In "Dirt