pendent Factor Description Data Characteristic
X1 Agriculturist’s Experience Quantitative
X2 Agriculturist’s Education Qualitative
X3 Cultivation Area (rai) Quantitative
X4 Density (no. of trees per area) Quantitative
X5 Longan Type Qualitative
X6 Tree Age (year) Quantitative
X7 Height of Longan Tree (m) Quantitative
X8 Tree Diameter (m) Quantitative
X9 Tree Space (m) Qualitative
X10 Shape of Longan Tree Qualitative
X11 Number of Times of Visit (per week) Qualitative
X12 Recuperating Period (month) Qualitative
X13 Continuation Qualitative
X14 Watering System Qualitative
X15 Potassium Chlorate Quantity (kg/tree) Quantitative
X16 Nutrient-adding Method Qualitative
X17 Soil Type Qualitative
X18 Irrigation Area Qualitative
Z1 Air Pressure Quantitative
Z2 Temperature Quantitative
Z3 Humidity Quantitative
Z4 Rainfall Quantitative
Z5 Evaporation Quantitative