US agriculture secretary Ann Veneman is planning a trip to China late this month, where it is expected she will raise concerns over the confusion prevailing over China's labelling laws on genetically modified foods.

US soybean sales to China have been clouded in confusion for months since the Chinese government imposed new rules. China is an important export market for US soybeans, but some 70% of US soybeans are cultivated using biotech seeds.

Veneman is scheduled to be in Beijing during the last week of July, after first stopping in Japan to promote US agricultural products, reported Reuters.