How to apply potassium nitrate to mango trees

Written by diane stevens Google
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How to apply potassium nitrate to mango trees
Increased mango crops result from inducing the flowering of the trees. (mango image by citylights from

Potassium nitrate was first studied in the Philippines as a possible way to induce flowering of mango trees. The spraying resulted in mango trees flowering within a week of the treatment and with more flowers per tree than untreated trees, resulting in a larger crop. Potassium nitrate is an inexpensive way to induce flowering and tends to result in a more uniform flowering than other methods. Interestingly, according to a paper from the University of Hawai'i, the process by which the potassium nitrate works to stimulate the flowering is unknown.

Skill level:

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Things you need

  • Potassium nitrate
  • Water
  • Sprayer

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  1. 1

    Wait for the trees to flush, producing new growth after harvest.

  2. 2

    Mix a solution of 10 grams of potassium nitrate per litre of water.

  3. 3

    Spray the trees early or late in the day, when rain is not expected for at least six hours. Spraying before nine a.m. or after four p.m. minimises leaf burning.

  4. 4

    Spray downward, from the top of the canopy, down to the bottom. Spray all branches and leaves.

Tips and warnings

  • Spray flower inducer only once per year.
  • Do not use a chemical inducer on trees younger than 10 years old, a tree that has young buds and leaves or a tree that is sickly.

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