Tangerines are a group of subtropical and temperate climate citrus trees belonging to the mandarin species. They are known for their rich red-orange skin and juicy, sweet flesh. Tangerines are commonly interbred with other mandarin species and other citrus fruits to produce tangelos and tangors. According to Texas A&M University, there are many dozens of cultivars of tangerines but among the most popular and commonly grown are Dancy, Changsha, Clementine, Fortune and Ponkan, also known as Chinese Honey. Regular fertilization and watering help ensure healthy trees and abundant crops.
Fertilize your tangerine tree three to four times each year stretched out over the growing season. Make the first application in spring after new growth is visible, the second in late spring, the third in midsummer and a fourth if desired in the late summer.
Use an ammonium sulfate granular fertilizer with a guaranteed analysis of 21-0-0 feeding a 1-year-old tree with one cup of fertilizer divided over the three to four applications.
Increase the dose to two cups of fertilizer in the second year, three cups in the third year and four cups in the fourth. Follow this step-up formula each year thereafter.
Cast the fertilizer granules on the soil surface under the tree starting at least a foot out from the trunk and extending out to the branch tips that define the drip line.
Water the fertilizer and surrounding soil in well until the soil is drenched with water to a depth of at least 8 inches. This will speed nutrients into the root zone and help evenly distribute the fertilizer in the soil preventing burn.