{Daucus carota var. sativa}

Boron Deficiency in Carrots

In the field, boron deficiency typically causes a superficial pinhead-sized discoloration just under the skin of the carrot. The grayish irregularly shaped areas are ordinarily only seen after steam peeling of the carrots and are usually removed by normal domestic peeling. Severe boron deficiency causes further symptoms to develop. The tap roots frequently split and are often brittle. Leaves may ultimately be affected, turning a red or yellow color and later, just before the growing point dies, very small leaves are formed.

Typical recommended ranges for boron boradcast soil application for carrots is 1-2 lbs of B/acre. Normal plant analysis levels for the best quality and marketability have leaf boron levels in the 25-70 ppm range.*

*Always consult local crop advisors to check the proper dose rates. Rates of boron fertilization should be based on yield goals along with soil tests and/or plant tissue analyses.

Soil Application (Suggested rates of application)

  Granubor Fertibor
LBS/ACRE 6.25 - 12.5 6.25 - 12.5
KG/HA 7.0 - 14.0 7.0 - 14.0

Foliar Application (Suggested rates of application)

KG/HA 2.8
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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