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Key Facts

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Role of Nutrients by Onion Growth Stage

Pre-Planting

Nitrogen and Potassium – promote strong early growth
Phosphorus – maximize root development and to supply reserves for season long growth and good bulbing
Sulphur – encourage plant growth
Boron, Manganese and Zinc – ensure good shoot growth

Vegetative Growth

Nitrogen and Potassium – ensure continued growth and development
Calcium, Sulphur and Magnesium – maintain vigorous, healthy leaf growth and to build plant supplies prior to bulbing
Micronutrients – ensure photosynthetic growth is not limiting

Bulb Formation

Nitrogen – in nitrate forms to maintain bulb development and early growth
Potassium – peak requirements are during bulbing – for yield and quality
Calcium – ensure good supply to the bulb to maximize eventual storage quality
Micronutrients – to maintain leaf growth

Bulb Fill

Nitrogen – in reduced amounts so as to maintain dry matter production but not compromise bulb quality
Phosphorus – encourage ripening, early maturity and a big bulb size
Potassium – maximize dry matter & sugar accumulation as well as quality
Calcium – maintain good bulb firmness and quality with reduced storage problems
Sulphur – depending upon the desired pungency of the onion
Boron – to improve storage quality and calcium uptake
Copper – for good skin quality. Other Micronutrients – less critical, but to maintain growth and prolong bulking

Onion Crop Nutrition

Select one of the links below to read more about improving this area of onion crop nutrition

Onion Yield
Onion Quality
Onion Health
Onion Environment

Go to Onion Crop Nutrition

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