{Ananas comosus}
Pineapple Cannonballs and Corking

Spotting a Boron Deficiency

Boron-deficient fruit on the left, resembling "cannonballs."

Boron Deficiency in Pineapple

Boron deficiency may cause abnormal development of the fruit. Few leaf symptoms have been reported. The fruitlets split and separate, and the cracks fill with gum. In very severe boron-deficiency cases, the growing point may die, followed by profuse development of side shoots and suckers. Root growth is poor. Main roots may be brown and few fibrous roots are produced. The deficiency is more pronounced on the ratoon than on the plant crop.

Soil Application (Suggested rates of application)

  Granubor 2 Fertibor
LBS./ACRE 6-13 6-13
KG/HA 6.75 - 14.63 6.75 - 14.63

Foliar Application (Suggested rates of application)

KG/HA 4.5 - 10.125
Value in Use
Application Method
Current Yield (Per Acre)
Expected Sale Price

Rio Tinto Borates is a global leader in the supply and science of borates - naturally-occurring minerals containing boron and other elements. Refined borates are essential nutrients for crops. We are 1,000 people serving 500 customers with over 1,700 delivery locations globally. We supply 30% of the world's need for refined borates from our world-class mine in Boron, California, about 100 miles east of Los Angeles.  Learn more about Rio Tinto

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