{Lactuca sativa}

Boron Deficiency in Lettuce

Boron deficiency causes a reduction in growth, malformation of the young leaves, and development of dark spots, usually near the leaf tip, which later develop into a marginal necrosis. The leaves are thick and brittle and are frequently cupped. Head development is poor, chlorosis also occurs, and the yellow heads become rotten in the center following the death of the growing point.

Tip burn on younger leaves has been associated with boron deficiency but this symptom is likely to be due to other factors. The early stages of boron deficiency can be confused with tip burn which, unlike boron deficiency, does not lead to lack of “hearting” and death of growing point. Roots on boron-deficient plants are brown, short, and knotted in appearance.

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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