Folia Horticulturae

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The effect of fertilization with different forms of nitrogen on certain senescence indices in short-term stored broccoli heads

Maria Leja*, Renata Wojciechowska*, Anna Mareczek*, Edward Kunicki**

**Department of Plant Physiology
**Department of Vegetable Crops and Horticultural Economics
**Agricultural University
**29 Listopada 54, 31-425 Kraków, Poland

The effect of nitrogen nutritives, applied in the form of ammonium nitrate and ammonium sulphate, on senescence of stored broccoli heads was investigated. A significant increase in free amino acids, total glucosinolates, and activity of peroxidase (POD) was observed during two week storage of broccoli at 5°C. Nitrogen treatment, especially when used in the form of ammonium sulphate, stimulated the above metabolic changes. A considerable reduction in the initial respiration rate was found in stored broccoli heads, accompanied by a decline in ednogenous ethylene evolution. In both cases a more profound decrease was observed in samples treated with nitrogen, particularly with ammonium sulphate.

Leja M., Wojciechowska R., Mareczek A., Kunicki E., 1997. The effect of fertilization with different forms of nitrogen on certain senescence indices in short-term stored broccoli heads. Folia Horticulturae 9/1: 85-96.