Utilize the input text as a context reference, choose the right relationship between rice farming and Rice from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

The Rice Council of Tanzania says its farmers have invested heavily in commercial rice farming and milling, resulting in improved production at 1.3 million metric tonnes per year -- against an annual demand of less than a million tonnes.

Answer: product_or_material_produced