{Musa spp.}

Boron Deficiency in Bananas

Boron is the most commonly deficient micronutrient in banana plantations. Boron’s primary role in banana is to act as a key component in a number vital process such as structure integrity of cell walls, cell division, root development, and membrane permeability of potassium (K+).

Boron is necessary for:

  • Proper growth and development
  • Pulp consistency
  • Sucker development

Incomplete expansion and unfolding of the youngest leaf is probably the most typical symptom of boron deficiency. In very severe cases, interveinal chlorosis and leaf malformation occur. The leaves may be narrow, rolled, and incompletely developed. Sucker development is likely to be very poor.

Leaf streaking

Boron deficiency first results in the development of small chlorotic streaks aligned perpendicular to and crossing the primary veins of the leaf blade. As the deficiency becomes more severe, the chlorotic streaks become longer and more concentrated, eventually extending through the leaf and, in some cases, appearing as slight protrusions on the lower surface.

Leaf streaking has been recorded in cases of boron deficiency. However, such streaks usually coalesce, forming patches, and ultimately become large necrotic patches. Boron deficiency is distinguished from sulfur deficiency by the absence of necrotic patches and the appearance of malformed leaves.

Blackening in the center of the pulp of the fruit has been observed in sand culture experiments. In the field the presence of amber colored gummy deposits (mostly towards the flower end) has also been associated with boron deficiency.

Spotting Boron Deficiency in Banana

How much boron is enough?

  • Banana plants remove significant amounts of boron from the soil each year. Once a plant shows signs of deficiency it cannot fully recover. Flowering may be regular however no fruit may be produced. Leakage of potassium from cell membranes may also occur. Always consult local department of agriculture to check the proper dose rates.
  • Rates of boron fertilization should be based on yield goals along with soil tests and/or plant analyses.

Timing your boron application

  • High demanding periods for boron are after harvest, blooming, and during fruit growth.
  • Boron may be applied in dry or fluid blends. With dry bulk blend fertilizer, broadcasting before planting is recommended, using Granubor®.
  • Boron may be applied broadcast in a semicircle around the plant using Fertibor®.
  • Boron in liquid fertilizers may be broadcast or fertigated using Solubor®. This material may also be mixed with pesticides or applied to foliage in aqueous spray.
Key Findings
Yield results when boron is added to the first cycle and second cycle

U.S. Borax Products for Banana

15% Boron |  | OMRI Certified
Optimum product for suspensions

A fine crystalline borate ideal for NPK compound fertilizers and suspensions. Manufactured as free-flowing granules, Fertibor is easily handled and offers superior flow and consistency.

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15% Boron |  | OMRI Certified
Made especially for bulk blenders

A pure, 100% water-soluble micronutrient that meets boron demand during the growing season. Made especially for bulk blenders, Granubor helps to ensure uniform distribution in nutritional blends and in the field.

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20.5% Boron |  | OMRI Certified
Product of choice for foliar applications

A concentrated, highly soluble, and fast dissolving powder that is ideal for foliar and other sprays. With the highest concentration of boron in any approved product, Solubor is an economical choice for nutritional formulations.

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20.8% Boron
Boron for fertilizer manufacturing

This refined U.S. Borax product is made from the dehydration and fusion of borax. Depending on the grade, Anhybor can be used to produce boron-enriched compound fertilizers or to coat different fertilizer products, such as NPK blends with the aid of a binder.

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10% Boron
Solubor Flow
For fertigation or hydroponic growing

First and only aqueous suspension of sodium borate microcrystals.

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14.5% Boron | 29% Zinc
Perfect combination of zinc and boron

Because zinc and boron deficiency are widespread around the world, a product with both nutrients is a good fit in many regions. Zincubor brings these two important micronutrients together in one product.

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Calculate Your ROI

Soil Application (Suggested rates of application)

  Granubor Fertibor
LBS/ACRE 13-24 13-24
KG/HA 14.63 - 27.00 14.63 - 27.00

Foliar Application (Suggested rates of application)

KG/HA 10.125 - 19.125
Value in Use
Current Yield (Per Acre)
Expected Sale Price

U.S. Borax, part of Rio Tinto, is a global leader in the supply and science of borates—naturally-occurring minerals containing boron and other elements. We are 1,000 people serving 650 customers with more than 1,800 delivery locations globally. We supply around 30% of the world’s need for refined borates from our world-class mine in Boron, California, about 100 miles northeast of Los Angeles. Learn more about Rio Tinto.

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