Technical support

Panjin's history of raising crabs dates back to the 1970s. In 1991, local people began to cultivate the crustacean in paddy fields. After years of trial and error, the local government helped crab farmers in Panshan county to overcome many technical problems so that farming crabs in paddy fields became popular on a large scale.

Moreover, cooperation with Shanghai Ocean University in Panjin led to the establishment of a new technology research center in 2011 to improve the output and quality of crabs.

The difference between paddy fields here and in other parts of the country is that those in Panshan county are surrounded by half a meter of plastic sheeting. From afar, the fields look like wide and narrow stripes. On the sides of the field the farmers plant soybean.

"A traditional rice row pitch is nine cun (about 30 centimeters). For the crabs, we changed it to six cun and three cun. As a result, we can guarantee the output of rice because the amount is unchanged but this method allows space for raising crabs," said Chen Weixin, head of Panshan Crab Technical Institute.

"This model allows paddies sufficient sunlight which can reduce insect damage, so we don't need to use pesticides. Also, crabs can clear weeds and their waste can improve soil fertility," she added.

"I can harvest rice, crabs and soybeans at the same time. The total profit amounts to 2,200 yuan for every one-fifteenth of a hectare, 800 yuan more than if I planted just rice. Moreover, the rice sells at a higher price than ordinary rice because it is grown without pesticides," Bai said.

Wang Wu summarized the so-called Panshan model as "1+1=5", namely, "Rice plus crab equals output increase plus food safety plus ecological security plus increase in farmers' income plus business efficiency."

In addition, due to its advantages, the Panshan model has been exported to more than 20 provinces and regions including Ningxia Hui autonomous region and Heilongjiang. The whole area is more than 87,000 hectares.