Boron Deficiency in North America

Boron deficiency map of the Eastern United States

High yield means high boron demand

Boron deficiency is a common issue east of the Rocky Mountains. High-yield growers understand the importance of boron for sufficient crop quality and production.

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Boron deficiency map for the Midwest

Boron rich, but not boron complete

The mineral-rich soils in this part of the country supply most of the micronutrient needs for high yielding corn and soybeans. However, boron supplementation is still recommended.

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Boron deficiency map of the Western United States and Western Canada

Difficult weather poses boron problems

Growers in this region consistently deal with challenging weather conditions. As a result, boron deficiencies are common, especially in the rainy Pacific Northwest. Drought in California in recent years has also presented issues.

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Relative susceptibility of North American crops

Certain crops are more susceptible to boron deficiency than others. To find out what boron deficiency may look like in your field, click a crop below.

Boron Deficiency in the Region

​U.S. Borax boron, mined and refined in California, has been providing reliable, high-quality boron to regional growers and fertilizer distributors for more than 50 years. With the highest percentage of available, water-soluble boron of any product and a refinement process that guarantees optimally sized, low-dust granules, our agricultural products meet the strictest standards and provide the best available ROI. Our refined boron products are available in granular or powder (for use in liquid formulations) form, for soil or foliar application as well as in a variety of fertilizer mixes.

U.S. Borax Products

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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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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11% Boron (w/w)
Liquid boron from boric acid

The convenience of liquid boron fertilizer straight to your farm with no measuring or mixing required.

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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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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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Regional field trials

Alfalfa (Wisconsin, USA)
Wisconsin (2020-2021): Granubor showed a better performance than the control at all rates even though not statistically different. Learn More
Corn (Mississippi, USA)
Mississippi, USA (2021): Granubor shows a better performance than the control and ulexite. Learn More
Soy (Mississippi, USA, Granubor)

Mississippi, USA (2022): Granubor helps soy better tolerate drought conditions.

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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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