"The urbanization rate is pretty high in some countries. The proportion of farmers in the total population in Japan is only about 3 percent, and that in South Korea is more than 6 percent. What we need to pay attention to is how many people will keep working on the cropland in China."

LI QIANG, dean of the School of Social Sciences at Tsinghua University, talking on Sunday about the challenges posed by urbanization. Statistics released by the China Data Center at Tsinghua University showed that most migrant workers don't plan to return to farming.