occurs in has_participant has participant has role mulch mechanical pest exclusion process mulching process A planned process in which a layer of material is apply to the soil surface to conserve moisture, improve soil fertility, reduce pests population and enhance the visual appeal of the area. https://en.wikipedia.org/wiki/Mulch https://orcid.org/0000-0001-6284-4821 mulch management mulching tractor mulch implement agricultural experimental plot draft animal role human power role mechanical control weeding process agricultural field environmental system process organism organism