ground cutaway with onion and earthworm. earthworms in garden soil.

agriculture compost composting concept crop cross cutaway dig dirt earth earthworm earthworms farm fertilizer field food garden gardening grass green ground growing growth grub humus illustration irrigation land landscape layer manure matter microorganism microorganisms mud nature nutrients nutrition onion organic peat plant process profile recycle root section soil stock sustainable topsoil tunnel underground vector vegetable waste worm