{Cocos nucifera}

Boron Deficiency in Coconut

Leaf malformations caused by boron deficiency were first seen in the 1960s. They are shown by the youngest leaves and are more or less identical with the ones found in oil palms.

The symptoms, in increasing order of severity, are:

  1. Fusion of terminal pinnae on the frond
  2. “Hook” or “bayonet leaf,” in which the pinnae are bent into a double or single hook near the tip
  3. Development of the fronds with very short pinnae either on one or both sides of the rachis
  4. In the most severe cases, frond development without any pinnae

The first two symptoms are the most common. Occasionally, the apical growing point dies.

The first sign of boron deficiency on 1-year-old coconuts is the development of small chlorotic spots on the young leaves. These spots are symmetrically orientated in relation to the main veins on the leaf. These boron-deficiency symptoms on very young palms bear a striking resemblance to those on young oil palms.

Related Crop

Spotting Boron Deficiency in
Coconut Trees

U.S. Borax Products for Coconut

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.

Learn more →

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.

Learn more →

Calculate Your ROI

Soil Application (Suggested rates of application)

  Granubor Fertibor
LBS/ACRE 9.0 - 18.7 9.0 - 18.7
KG/HA 10.0 - 21.0 10.0 - 21.0

Foliar Application (Suggested rates of application)

LBS/ACRE Not recommended
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.

Copyright © 2024 Rio Tinto. All Rights Reserved.