Organic Fruit Tree Fertilizer: Application Rates for Oranges


Scroll down for recommended fruit tree fertilizer application rates

BioStar™ Organics produces a wide variety of high-quality organic fertilizer products that are the best of all choices of organic fruit tree fertilizer. Our patent pending technologies have taken common poultry manure to a level not seen in the organic fertilizer marketplace. They are produced using revolutionary technologies that benefit farms, their local communities, and the greater eco-system as a whole.

All of our chicken manure organic fertilizer products are pathogen and harmful bacteria free, OMRI certified and approved for use on food crops, including fruit and fruit trees, because the BioStar anaerobic digestion process destroys the pathogens in manure.  Most liquid organic fertilizers are not approved for use on Tier 1 fruits and vegetables that go straight from the farm to your table within 90 days of harvest, but BioStar Organics fertilizers are OMRI listed for use with no restrictions!   We produce liquid and granular fertilizers, fast-acting and slow-release nitrogen fertilizers, as well as an organic liquid soil conditioner that is a complete package of nutrients, and an organic/synthetic high nitrogen lawn fertilizer. You can read a summary of all of our organic fertilizers, or view product sheets for all of our types of organic fertilizer products.


Neither the timing of application nor the number of applications of nitrogen appears to matter as much as the consistency of applications from year to year. Most growers make a single application of organic fruit tree fertilizer annually, usually two or three months prior to bloom. A few growers utilize split applications, with two-thirds of the rate applied pre-bloom and the balance in May. Growers who inject fruit tree fertilizer through the irrigation system or drip irrigation systems commonly make injections at least monthly through the year.

  • The total amount of synthetic nitrogen to be applied per season depends greatly upon the age of the fruit trees.
    • Trees aged 4-5 years should get 75 lbs. N/acre/year
    • 6-7 year old trees 100 lbs. N/acre/year
    • 8-9 year old trees 125 lbs. N/acre/year
    • Groves over 10 years old a standard 150 lbs. N/year.

Synthetic vs. Organic Fruit Tree Fertilizer

The rates above are based upon the use of soluble synthetic nitrogen fertilizers and, as such, use of a high nitrogen organic liquid fertilizer such as SuperSix would lower these rates by approximately 20%.  SuperSix is the ONLY fast-acting liquid organic ammoniacal nitrogen fertilizer in this high concentration.

  • SuperSix application rates
    • Fertile organic soils should be 80-100 lbs. N/acre/season, which translates to 140 to 175 gallons of SuperSix/acre/season.
    • Sandy soil groves should get 100-120 lbs. N/acre/season, which translates to 175 to 220 gallons SuperSix/acre/year.

Winter-applied foliar sprays of 50 to 60 pounds of fruit tree fertilizer per acre of low-biuret urea have increased navel orange production in California. Similar results have been reported for Valencia oranges in Florida. As such, we recommend the same with the use of SuperSix, if foliar applications are possible.

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