The new theory is the primary use, if there is a certain amount of land is divided into 4 parts: 30% off, digging a pool, water retention. 30% of cultivated rice. 30% of the fruit-growing10% of the residential
Using the new theory is that if a certain amount of land is divided into four parts: 30% to dig a pond to store water 30%, rice 30% fruit , 10% residential.