Successive monitoring surveys of selected banned and restricted pesticide residues in vegetables from the northwest region of China from 2011 to 2013

Table 5 Pesticide residues in different seasons, and organic vs. conventional vegetables

Types	Sample numbers	Samples with residues above MRL		χ²	P
Types	Sample numbers	NO.	Rates (%)	χ²	P
Vegetables in winter and spring	224	13	5.8	2.038	0.153
Vegetables in summer and autumn	294	27	9.2	2.038	0.153
Anti-seasonal Vegetables	124	12	9.7	0.875	0.350
Seasonal Vegetables	394	28	7.1	0.875	0.350
Organic Vegetables	98	1	1.0	7.619	0.006
Conventional Vegetables	420	39	9.3	7.619	0.006

ISSN: 1471-2458