The effect of organic fertilizers on the chemical quality of onions
2014
Olle, M. | Williams, I. H.
The aim of the present investigation was to evaluate the effect of organic fertilizers on the chemical content (nitrates, calcium, vitamin C, dry matter and crude ash) of onions. Four fertilization treatments were compared: 1. Phytopellets standard, 2. Malzkeim pellets, 3. Organisher Baumdünger, 4. without fertilization (control). The dry matter content of the onions did not differ significantly with different organic fertilizers. Different organic fertilizers did not significantly affect the crude ash content of onions although fertilized onions had a greater crude ash content than unfertilized onions. The content of nitrates in onions did not differ significantly with use of different organic fertilizers although fertilized onions had a greater nitrate content than unfertilized onions. Different organic fertilizers did not significantly affect the calcium content in onions. The content of vitamin C in onions did not differ significantly with the use of different organic fertilizers, although fertilized onions had a greater vitamin C content than unfertilized onions. The conclusion of the investigation was that organic fertilizers did not affect the chemical quality of onions statistically. The crude ash, nitrates and C-vitamin was lowest in the unfertilized control treatment.
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