Table 3.

Vegetable farming period in different area.

	Urban					Suburban					Rural
Site no.	1	3	4	5	6	2	8	9	10	12	7	11	13	14
Cultivated time (year)	20	20	40–50	10–20	20–30	2	20–30	2	3	10	5–6	10	5–6	2