Effect of rootstock/scion compatibility on fruit and foliar nutrient composition in avocado (Persea americana Mill.) cv. Hass in Colombia nork Tamayo-Vélez, Álvaro de Jesús, Bernal-Estrada, Jorge Alonso, Díaz-Díez, Cipriano Arturo, Cano-Gallego, Lucas Esteban, Córdoba-Gaona, Oscar de Jesús