We update all of our records annually through a combination of public sources like the USDA, state and local government, and also include privates sources only made available to DTN. The grower database has the land & crop information updated annually and the grower address information and phone numbers updated bi-annually. Email addresses are updated and validated throughout the year. The grower data is matched against the DPV, NCOA and Deceased databases to keep the data as deliverable as possible.