Boron Fertilizers | Solubor, Boric Acid & Fertibor

Compare Solubor, Optibor boric acid, and Fertibor boron fertilizers for crop nutrition and fertilizer formulation. Choose by boron analysis, material form, application method, and package size rather than treating these sources as interchangeable.

Compare three boron sources

• Solubor: disodium octaborate tetrahydrate with 20.5% guaranteed boron. An ultra-fine soluble material for label-directed fertigation, foliar, and hydroponic nutrient programs. Available in 8 oz, 1 lb, 4 lb, 20 lb, and 50 lb packages.
• Optibor boric acid: orthoboric acid with 17.5% boron and 99.9% purity, as specified in our product listings. A boron source for water-soluble nutrient preparation, available in 8 oz, 1 lb, 4 lb, and 55 lb packages.
• Fertibor: granular disodium tetraborate pentahydrate with 15.2% typical boron. Its listed uses include solid, liquid, and suspension fertilizer manufacture, growing-media incorporation, and crop-specific direct soil applications. Available in 1 lb, 4 lb, and 50 lb packages.

Select for your application

For injection systems and foliar programs, review the selected product's directions, dissolution requirements, and suitability for the intended concentration. For fertilizer blending or media incorporation, consider the material form and processing requirements. Fertibor's granular form and listed formulation uses should not be treated as a blanket recommendation for hydroponic or foliar application.

Calculate additions from the boron analysis

These materials contain different percentages of boron, so equal product weights do not supply equal amounts of boron. Base additions on crop-specific recommendations, relevant water, soil, or tissue analysis, and contributions from other fertilizers. Follow product directions and consult a qualified crop advisor or agronomist for application rates.

Review each product's specifications and safety data sheet before use. Check stock-solution concentration limits and mixing instructions rather than assuming working-solution solubility applies to concentrated blends.