The soil in farmland in Sanya City is generally acidic, with low levels of organic matter, available phosphorus, potassium, and nitrogen. The average pH value is 5.33, with organic matter ranging from 0.15% to 6.17%, available phosphorus from 0.36 to 375.76 mg/kg, available potassium from 0.42 to 677.68 mg/kg, and available nitrogen from 1.36 to 683.53 mg/kg. Guidelines for fertilizing different crops based on these soil nutrient levels have been suggested.