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Research comparing soil quality using volcanic soil combined with organic fertilizer to improve soil quality in mixed organic agriculture gardens according to the principles of the Royal Initiative of Her Royal Highness Princess Maha Chakri Sirindhorn, in Nayong District, Trang Province, aims to: 1) Study the physical characteristics of soil, soil moisture content, soil temperature, soil acidity, soil alkalinity, and nutrient content in soils using and not using volcanic soil combined with organic fertilizer to improve soil quality in mixed organic agriculture gardens. 2) Study the soil quality in mixed organic agriculture gardens using volcanic soil and organic fertilizer to improve soil quality during different time periods. The researchers were interested in studying the physical characteristics of soil, moisture, temperature, acidity-alkalinity, and soil nutrients as indicators of soil quality. It was found that before using volcanic soil combined with organic fertilizer, the soil was relatively acidic, the soil texture was dense, soil moisture was low, and soil nutrients were low. After using volcanic soil combined with organic fertilizer to improve soil quality in mixed organic agriculture gardens, there were differences, with the soil becoming less acidic, the soil texture becoming looser, soil moisture and soil nutrients increasing. The soil quality in mixed organic agriculture gardens using volcanic soil and organic fertilizer to improve soil quality during different time periods varied. During the period of soil improvement by adding volcanic soil, the soil became less acidic, moisture and soil temperature increased, and minerals, especially potassium, increased. After adding organic fertilizer, soil moisture and temperature increased, nitrogen levels increased significantly, and when adding chemical fertilizer by 10%, the physical characteristics of the soil were good, with suitable moisture, acidity, alkalinity, and temperature. The soil became fertile.