Boron in Crop Nutrition: Function, Deficiency and Use
FAQ
Q: Why can't boron simply be applied heavily?
Boron has a very narrow deficiency-to-toxicity window. Too little causes flowering and fruit-set failure; too much causes toxicity (e.g. leaf-margin scorch). Soil boron is immobile, so precision matters more than quantity.
Q: Which crops are most boron-responsive?
Fruit trees (apple, citrus, mango), legumes, rapeseed, cotton, sugar beet and many vegetables respond strongly. Their yields and quality drop sharply under deficiency.
Q: Foliar or soil application?
A small soil basal dose plus targeted foliar sprays at flowering and fruit-set is the most controllable approach, especially on leached or acidic soils.
Key Points
Function: pollen viability, sugar transport, cell wall
Deficiency signs: deformed terminal buds, poor flowering, fruit deformity
Responsive crops: fruit trees, legumes, rapeseed, vegetables
Safe rule: low basal + precise foliar, never over-apply
Quick Reference
| Boron function | Pollen, sugar transport, cell wall |
| Deficiency window | Very narrow |
| Best timing | Flowering + fruit-set |
| Method | Basal + foliar |