Selling cereals and grains only requires a trademark registration. Take Yihai Kerry Company, which deals in grain and oil products, as an example. Its various edible oils and rice all use the "Golden Arowana" trademark. COFCO's grain and oil products all use the trademark "Fu Linmen". If your company deals in grains such as sorghum, corn, soybeans, mung beans, etc., you only need to register a trademark.