The largest grower and exporter of turnips is the United States with 90% of turnips grown inside the United States coming from the state of California. The other 10% primarily come from the states; Alabama, Florida, and Georgia.
Australia is the largest exporter of coal ~ see related link below .
Chile is the largest exporter of copper in the world.
Japan
Bangladesh
Russia
Indonesia
I assume you mean exporter. The second largest exporter of coffee is Colombia.
The United States is currently the world's largest phosphate exporter.
Canada
United States
Chile