On 15 December 2016, Mrs. Jitkasem Tantasiri, Deputy Director-General of Thailand International Cooperation Agency (TICA) led the Tonga Delegation, headed by H.E. Ratu Tevita Kapaiwai Uluilakeba Mara, Deputy Private Secretary to His Majesty and responsible for Royal Estate and TICA/Palace Office Tonga Project, to visit “Acid Sulfate Soil Improvement Project Under the Royal Initiatives, Chaipattana Foundation” in Banna District, Nakhon Nayok Province for briefing on the New Theory regarding Agriculture Development as well as visiting the demonstration farms.