Farmers are busy planting rice seedlings on a farm in Guanshan town, Rong county of Zigong city, on April 20. Farmers in the town combine rice, traditional Chinese medicine planting, and crayfish breeding in a cycle every year. By using the water three times, every 0.4-hectare field here can harvest five hundred kilograms of rice and create a revenue of 10,000 yuan annually. [Photo/China.org.cn]