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Expert Tips on Choosing a Fertiliser for Your Mango Tree

Remember that mango trees, especially young ones, can be sensitive to over-fertilisation. For this reason, it’s best to select an organic fertiliser that is slow release.

When selecting the best fertiliser for a mango tree, you want to remember that your aim is to grow a healthy tree that produces lots of fruit.

This requires a fertiliser that has ample amounts of potassium as this is the nutrient that will encourage fruiting.

Mango tree fruit | Fruit & Vegetables

It’s also important to note that younger mango trees need a slightly different fertilising schedule than more mature trees that are already bearing fruit.

Additionally, mango trees that are growing in sandy soils will need more fertiliser than those grown in loam or clay.

Which fertiliser to use for young mango trees

For mango trees that are younger than three years, you should select a fertiliser that has an adequate amount of nitrogen, phosphorus and potassium. Phosphorus is quite important at this stage as it promotes good root formation.

Also, ensure that the fertiliser has a decent percentage of magnesium.

Remember that mango trees, especially young ones, can be sensitive to over-fertilisation. For this reason, it’s best to select an organic fertiliser that is slow release such as cow manure or Dynamic Lifter. 

Cow manure | Fruit & Vegetables

Cow manure has an N:P:K ratio of around 0.6: 0.4: 0.5, so it is ideal. The lower concentration of nutrients, especially nitrogen, means that it won’t burn the roots of your young trees.

Make sure that the manure has been well-composted before adding it to the soil around your mango tree. Avoid chicken manure because this is likely to burn the roots of your tree as it has a much higher concentration of nutrients.

On the other hand, Dynamic Lifter has an N:P:K ratio of 3.6: 1.1 1.7. As this is a slow-release product, it should not burn the roots of your growing mango tree. It also has added magnesium.

On that note, avoid using Blood and Bone, as this fertiliser is quite high in nitrogen and may cause fertiliser burn.

A brief guide to N:P:K ratios

N – The first number represents the amount of nitrogen in the product. Nitrogen promotes vigorous leaf growth and deep greening of plants, but too much can cause the burning of foliage.

P – The second number represents the amount of phosphorus in the product. Phosphorus promotes root growth and flowering.

K – The third number represents the amount of potassium in the product. Potassium helps plants withstand stress and promotes overall hardiness and disease resistance. It’s also important for fruiting and flowering.

You can also supplement this fertiliser with a few applications of Seasol as a tonic. Original Seasol does not act as a fertiliser but rather as a soil conditioner. It will help to promote strong root growth.

Which fertiliser to use for mature mango trees

Mango tree 2 | Fruit & Vegetables

Once your mango tree has reached maturity, you should look for a fertiliser that has an N:P:K ratio of somewhere in the range of 8: 3: 9. Notice that this type of fertiliser has more potassium as this will encourage flowering and fruiting. 

Once again, you want to ensure that the fertiliser has an adequate amount of magnesium.

A good example of an ideal fertiliser is Richgro’s Rock Mineral Fertiliser & Soil Improver. It’s a natural product made from rock minerals. It’s also slow-release and helps to stimulate microbial activity in the soil.

This fertiliser has an N:P:K ratio of  11: 2: 9 which makes it ideal for mango trees.

Alternatively, there are many citrus fertilisers available on the market that are also ideal for mango trees.

FAQ

What is the best time to fertilise mango trees?

Ideally, young mango trees should be fertilised twice a year in mid-spring and mid-summer. More established trees that have reached fruit-bearing age should also be fertilised twice a year in early summer while they’re fruiting and once again in late summer after the fruit has been harvested.

Is Seasol good for mango trees?

Seasol can be used as a tonic for mango trees. It is especially useful when establishing new trees because it helps with root growth and ensures your tree gets off to a good start.

Do mango trees need a lot of water?

Young mango trees need to be given adequate water from spring right through to the end of autumn. Watering should be reduced over winter. Once your mango tree has matured, it shouldn’t require supplementary watering unless you’re experiencing a long dry spell.

Is Epsom salt good for mango trees?

Epsom salt is beneficial if your soil is deficient in magnesium. Sufficient magnesium in the soil or the fertiliser that you use will help to produce full-flavoured fruit. If you discover that your soil is deficient in this mineral, you can apply Epsom salt to remedy this deficiency.

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Annette Hird

Annette Hird is a gardening expert with many years of experience in a range of gardening related positions. She has an Associate Diploma of Applied Science in Horticulture and has worked in a variety of production nurseries, primarily as a propagator. She has also been responsible for a large homestead garden that included lawn care, fruit trees, roses and many other ornamental plants. More recently, Annette has concentrated on improving the garden landscape of the homes that she has lived in and focused a lot of energy on growing edible plants as well. She now enjoys sharing her experience and knowledge with others by writing articles about all facets of gardening and growing plants.

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