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Sunflower

{Helianthus annuus}
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Boron deficiency in sunflower

Boron deficiency symptoms first appear on the youngest leaves which become progressively smaller and malformed. The stem is short due to lack of extension of the cells in the internode.

Distortion of flower heads is commonly seen and seed set on the head is very uneven—sections of the head may show no seed set at all. This symptom is associated with the boron requirement of the pollen tube.

When the deficiency is very severe, the growing point dies and no flowers will form.

Sunflower Resource
Blog: Not Just a Pretty Face: Boron Benefits for Sunflowers

Spotting boron deficiency in sunflowers

Aborted flower head from insufficient boron

Aborted and malformed sunflower head

Sunflower: Incomplete seed development

Incomplete seed development

Sunflower: Malformed flower development

Malformed sunflower development

Sunflower: Malformed flower center development

Malformed flower center development

Sunflower: Malformed head

Malformed head

U.S. Borax products in sunflowers

15% Boron | | OMRI Certified
Fertibor
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
Granubor
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
Solubor
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
Anhybor
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
Zincubor
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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Soil Application (Suggested rates of application)

  Granubor Fertibor
LBS/ACRE 9.0 - 18.7 9.0 - 18.7
KG/HA 10.0 - 21.0 10.0 - 21.0

Foliar Application (Suggested rates of application)

  Solubor
LBS/ACRE 3.6
KG/HA 4.0

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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