The effect of fertilization with different forms of nitrogen on certain senescence indices in short-term stored
Maria Leja*, Renata Wojciechowska*, Anna Mareczek*, Edward Kunicki**
**Department of Plant Physiology
**Department of Vegetable Crops and Horticultural Economics
**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.