His Majesty King Bhumibol, in his ceaseless efforts to improve the living standards of the rural people, has developed a new theory on land and water management. It is based on the division of the agricultural land of each rural household, which averages 10 to 15 rai, into four parts according to use in the proportion of 30-30-30-10 as follows:
Part 1: 30% of 10-rai piece of land is used for a reservoir.
Part 2: 30% of the land is devoted to rice cultivation which will produce enough rice for the household needs.
Part 3: Another 30% of the land may be used for growing more rice or horticultural crops, depending on the local conditions and the market demand.
Part 4: The remaining 10% of land is used for building a house, paths and ditches and also for growing household vegetables and raising livestock.