How to improve onion firmness
Nitrogen influences onion firmness
Nitrogen plays an important role in bulb firmness. Potassium and calcium deficiencies can also lead to bulbs with lower densities.
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.
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