RPI Index
1.The change of main cereal crops were the following:rice sowing areas in Changjiang Middlelower Basin District,Southeast China District and Sooth China District were still dominant in China and with 60%-70% of total cereal crops sowing areas in their Zones,although their sowing areas began to drop; Regional Productivity Index(RPI) of X decreased and RPI of Southeast Vhina District and South China District increased.
