What kind of plant food do avacado plants like?

Answer 1

The major nutrients needed by avocado trees are Nitrogen, Phosphorus and Potassium (NPK) in a 7-4-2 fertilizer and Zinc. Feed young trees 1/3 to 1/2 pound of actual nitrogen per tree per year, spread out over several applications if you like.
When watering, it is best to soak the soil well, then allow it to dry out somewhat before watering again. At planting, the tree can hold about 2 gallons of water. Depending on the weather, your tree may need a gallon of water a day along the coast. Typically, trees need to be watered two to three times a week. A mature tree will take about 20 gallons of water a day.
TIP:
# To test to see if irrigation is necessary, dig a hole 9 inches deep and test the soil by squeezing. If it is moist (holds together), do not irrigate; if it crumbles in the hand, it may be watered.
# Never enter winter with wet soil. Avocado trees may not need irrigation during the winter rainy season, but watch for prolonged mid-winter dry spells.

Answer 2

Usually the same type of plant food (fertilizer) as citrus trees. You can buy some at any garden store (like Home Depot).