The area of Khao Hin Sorn Subdistrict was formerly prominent with rocks – big and small- overlapping one another. The area was also the Phanom Sarakham Tropical Evergreen Forest, one of the country’s most fertile lands. Later, when the roads were built around the area, the villagers encroached upon the forest for doing agriculture. The forest was destroyed, the soil became unfertile, sandy and eroded, and could hold only 30 millimetres of water. Mono-cropping was implemented without proper soil nourishment, resulting in low productivity.
His Majesty the King gave an analysis of the problems in this area as follow: “the Khao Hin Sorn Royal Development Study Centres, Phanom Sarakham District, Chachoengsao Province: 1979 There was deforestation for cultivating crops such as corn and cassava, resulting in the decrease of soil fertility. The soil becomes sandy and contains little nutrients. Wind erosion occurs in the dry season and water erosion in the rainy season”
In the past, the Huai Sai area was once a fertile forest with abundant wildlife species, especially “hog deer” (or Nua Sai in Thai) from which the name “Huai Sai” was derived. Later, this area was encroached upon by local villagers for agriculture. Abundant forest turned arid, with unseasonal rainfalls and dry spells. The soil became deteriorated due to the lack of maintenance and the use of insecticide in agricultural activities.
His Majesty the King along with Her Majesty the Queen and Her Royal Highness Princess Maha Chakri Sirindhorn inaugurated King Taksin Memorial Monument at Thung Na Choei Park in Chanthaburi Province and gave the royal initiative to Chanthaburi Governor as follow: “To consider finding a site suitable for implementing an occupational development project in the areas of fishery and agriculture along the eastern coast of Chanthaburi Province”
Later on 30 December 1981, His Majesty graciously gave the additional recommendation at Chitralada Villa as follow: “Please consider locating a degraded forest in a national preserve to be site of a Development Study Centre, like that at Khao Hin Sorn, where coastal development can be studied”
"Generate More Water, Grow More Forest, Harvest a Sufficient Life" Establishment of Pupan Royal Development Study Centre, Sakon Nakon Province
From 2-20 November 1955, Their Majesties graciously visited the people in the Northeast then witnessed the problems of poverty, scarcity and infertility of natural resources.
"Pupan Royal Development Study Centre, Muang District, Sakon Nakon Province was once a thin forest, a place where people harvested firewood. This place was then turned into agricultural fields, while the higher-up forests were severely encroached. In dry season water was scarce but flowed hard in rainy season. Thin top soil, a consequence of soil erosion, allowed patches of subsurface salts to rise.
On February 22, 1982, His Majesty King BhumibolAdulyadej graciously visited the lower Huai Hong Khrai reservoir, constructed to supply water for the villages of San Kam Pang Cooperatives community. On this occasion, His Majesty granted his wish of raising mulch cattle in the arid area full of rocks above that reservoir of which reported by Mr. TinakornKomkrit, an expert on livestock, that it was almost impossible to do so. "it occurred at that moment that it would have been a challenge in getting hold of that area and made it possible in 5 years' time." "on December 11, 1982, the whole of Huai Hong Khrai watershed was asked to be used as a Development Study Centre, covering 8,500 rai of deteriorated forest caused by illegal logging and wild fires. The soil mostly eroded and full of rock and gravel" His majesty graciously gave his visuals on Huai Hong Khrai soil condition "HuaiHong Khrai : Rock Gravel Drought" and that of the cause of degradation "deforestation in rainy seasons cause water erosion and the soil is leached, leaving only rock and gravel"
"Large areas of Narathiwat Province are lowland areas of poor soil quality, facing water-logged condition all year round, amounting to approximately 300,000 rai altogether. They consequently deprived most farmers of any meaningful land utilization. And even after the land has been completely drained, it still not prove viable for any agricultural purposes, due to such high content of pyrite in the soil giving rise to sulphuric acid, and would turn further acidic when dried. Therefore, it would be necessary for various agencies concerned to come together, and jointly study and find ways to improve this Phru land in a common harmonized approach. Afterwards, the project success may be applied to develop other Phru land areas further elsewhere"