Proximate and Nutritional Composition of Stored Bulb Onions as Affected by Harvest and Postharvest Treatments

Table 3

Nutritional composition of stored bulb onions as affected by postharvest treatments.

Factors	Treatments	Vitamin C (mg/100 g)	Zinc (mg/100 g)	Phosphorus (mg/100 g)	Potassium (mg/100 g)	Calcium (mg/100 g)	Sodium (mg/100 g)	Iron (mg/100 g)
Harvesting stage	75% top fall	5.20 A	0.14 A	19.91 A	111.71 A	14.00 A	4.46	0.182 A
	50% top fall	4.32 B	0.13 A	20.17 A	109.13 B	12.23 B	4.33	0.177 B
	25% top fall	2.85 C	0.06 B	17.39 B	104.81 C	10.97 C	4.36	0.176 B
	value	<0.0001	0.004	<0.0001	<0.0001	<0.0001	0.098 (NS)	0.0005
	Standard error	0.031	0.017	0.238	0.487	0.258	0.122	0.001
Curing period	2-week curing	4.97A	0.13	19.70 A	110.89 A	13.14 A	3.48 B	0.179
	1-week curing	4.16 B	0.13	19.27 A	109.49 B	12.42 A	4.34 A	0.179
	No curing	3.24 C	0.08	18.50 B	105.28 C	11.63 B	4.48 A	0.177
	value	<0.0001	0.068 (NS)	0.002	<0.0001	0.0004	<0.0001	0.177 (NS)
	Standard error	0.031	0.017	0.238	0.487	0.258	0.012	0.001
Topping time	Topping after	4.38 A	0.11	19.71 A	110.11 A	13.16 A	4.24 B	0.180 A
	Topping before	3.87 B	0.12	18.61 B	106.10 B	11.64B	4.62 A	0.176 B
	value	<0.0001	0.609 (NS)	0.0001	<0.0001	<0.0001	<0.0001	0.010
	Standard error	0.025	0.014	0.194	0.398	0.211	0.034	0.051
Seasonal variations	Season 1	4.24 A	0.10	16.44 B	112.20 A	12.85 A	4.61 A	0.180 A
	Season 2	4.00 B	0.12	21.87 A	104.91 B	11.95 B	4.25 B	0.177 B
	value	<0.0001	0.233 (NS)	<0.0001	<0.0001	0.003	<0.0001	0.040
	Standard error	0.031	0.014	0.194	0.398	0.211	0.037	0.001

Means followed by the same letter within the column are not significantly different based on SNK at alpha = 0.05, n = 108.