JINAN -- China has established more standards and testing organizations to enhance supervision over the quality of agricultural products, said an official with the Ministry of Agriculture on Sunday at the ongoing 5th China Agricultural Trade Fair.

The official said China has introduced more than 800 national standards, 2,380 industrial standards and 8,000 local standards to make clear testing and inspection requirements of agricultural products.

He said by now the nation has set up more than 2,000 state and local testing and inspection centers to keep close watch on the quality of agricultural products and provide technical support for farmers.

Food safety has become a major public concern in China after a spate of food problems occurred.

With the theme of "Green Agriculture, Harmonious Countryside", the four-day fair kicked off on Saturday in Jinan, capital of east China's Shandong Province, and attracted more than 1,600 food companies, mostly green food makers, from home and abroad, including 300 international purchasers.