11. In 1984, Oregon Tilth established an early organic certification service in the United States. 12. In December 2010, the ACHS Apothecary Shoppe became Oregon Tilth Certified Organic ( OTCO ). 13. In 2014, she made presentations on the project at Frye Art Museum and Seattle Tilth . 14. It's time to plant cover crops of winter rye, to add nitrogen and tilth to the soil. 15. Digging destroys the soil's tilth , and just walking on grassy paths and lawn causes destructive soil compaction. 16. We rose above our abject dependence on weather, tide and tilth ; we were safe in the arms of empire. 17. Smaller events include Seattle Tilth 's chicken coop tour and the Wallingford Neighborhood office's garden and home tours. 18. A brownfield site adjacent to Humboldt Park is being developed by Urban Tilth as a community farm producing locally grown produce. 19. Advantageous changes are high weed suppression, soil loosening by the large hemp root system and the positive effect on soil tilth . 20. Over a period of time in a well-mulched soil, the surface soil is often in a state of fine tilth .
