Nitrogen can help to increase the specific weight of the outer skin, which results in an improvement of the bulb’s resistance to pressure, therefore reducing handling and storage damages. However, overall bulb firmness may decrease with high rates of nitrogen due to a softening of internal tissue.
Improving Onion Bulb Firmness
Firmness is a critical characteristic of onion and garlic crops, particularly in dry bulb onions which are stored for long periods. Growers can influence bulb firmness by applying a balanced nutrition.
Crop Nutrition and Onion Bulb Firmness
Nitrogen plays an important role on bulb firmness. Potassium and calcium deficiencies can also lead to bulbs with lower densities.
Nitrogen
Recommended Yara Fertilizers for Onions
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YaraMila COMPLEX
12-4.8-14.9 + 8% S - Prilled NPK fertilizer which also contains magnesium and sulphur as well as micronutrients ideal for use on a wide range of arable and horticultural crops.
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YaraLiva TROPICOTE
15.5% N + 19% Ca - Granular calcium nitrate fertilizer for field application to a wide range of crops.
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MAINCROP S
14-5.7-17.4 + 2.2% S - A quality size matched NPK plus S size matched blended fertilizer, ideal for use for potato production due to the ratio in the of N P and K whilst including a useful amount of sulphur.
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STARTER SOLUTION PLUS
A liquid fertilizer for placement which aids rapid crop establishment, promotes efficient utilization of phosphate and improves phosphate availability.
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YaraVita BORTRAC 150
A liquid micronutrient fertilizer containing 150 g/l boron for foliar application to provide additional boron or to treat boron deficiencies in a wide range of crops.
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YaraVita BRASSITREL PRO
A flowable liquid suspension fertilizer with a combination of micronutrients including manganese, magnesium, boron and molybdenum for foliar application to oilseed rape, brassicas and legumes.