{Brassica napobrassica}

Boron Deficiency in Rutabaga

When rutabaga is boron deficient, brown, water-soaked areas develop in the root, normally in the outer regions of the xylem. These symptoms give rise to the various names for boron deficiency such as “brown heart,” “water core,” and “Raan.” In severe cases, the central tissue may break down and the root become hollow. The feeding value is reduced and the roots are likely to be tough, fibrous, and bitter. Keeping quality is poor and affected roots lose weight through loss of moisture in storage.

Normally no symptoms are seen on the leaves. The roots will be of normal size and the problem is only apparent after harvest.

Typical recommended ranges for boron boradcast soil application for rutabaga is 2-3 lbs of B/acre. Normal plant analysis levels for the best quality and marketability have leaf boron levels in the 25-60 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 6-18 6-18
KG/HA 6.75 - 20.25 6.75 - 20.25

Foliar Application (Suggested rates of application)

KG/HA 4.5 - 10.125
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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