Evaluation location: Puerto Rico, United States
Eight rambutan cultivars were evaluated at the USDA-ARS Isabela Research Farm (Coto clay: clayey, kaolinitic isohyperthermic Typic Hapludox) for fruit production and quality. Six months old trees grafted onto R-167 rootstocks were transplanted to the field July 21, 1999. Soil type for the site was Oxisol, pH in water 6.0; pH in calcium chloride, 5.1; Ammonium nitrogen, 37.5 mg/kg; Nitrate nitrogen , 21.0 mg/kg; Organic carbon, 1.27 %; Phosphorus, 63 kg/ha; Potassium, 500 mg/kg; Calcium, 732 mg/kg; Magnesium, 133 mg/kg. Historical weather data for this site are: rainfall 1649 mm; evaporation , 1672 mm; maximum temperature, 29.8 (C); minimum temperature, 19.9 (C); mean temperature, 24.9 (C), elevation, 126 m.