Boron Deficiency in Peppers

When compared to other vegetables, peppers require a higher level of boron. Symptoms of boron deficiency in pepper plants usually first appears in the leaves, including:
•    Loss of color
•    Yellowing
•    Cupping
•    Thickening of leaves near the growth point

When boron deficiency becomes more severe, pepper plants may exhibit the following symptoms:
•    Early-stage flower bud termination
•    Flower, leaf and/or fruit bud drop
•    Stunted, underdeveloped root nodules 
•    Shoot apical meristem death resulting in dwarfed plants
•    Uneven fruit maturity, brown or black marks, deformation, cracking, and cork

How much boron is enough?

Only a small quantity of boron is needed to correct boron deficiency. A soil test can help determine how much boron may be needed. In addition, excess calcium and soil pH can affect boron uptake.



Soil Application (Suggested rates of application)

  Granubor Fertibor
LBS/ACRE 9.9-26.4 9.9-26.4
KG/HA 4.5 - 12 4.5 - 12

Foliar Application (Suggested rates of application)

LBS/ACRE 992-1323
KG/HA 450 - 600
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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