Table 2.

Correlation between heavy metal concentration in soil and heavy metal concentrations in roots and edible parts of three selected vegetables during 2016 and 2017

Heavy metals	Vegetable species	Combination	2016		2017
			r value	p value	r value	p value
Pb	L. siceraria	Soil × roots	− 0.9996	p < 0.01	− 0.9801	p < 0.01
		Soil × edible parts	− 0.9908	p < 0.01	− 0.9487	p < 0.01
	A. esculentus	Soil × roots	− 0.9680	p < 0.01	− 0.9955	p < 0.01
		Soil × edible parts	− 0.9781	p < 0.01	− 0.9783	p < 0.01
	Z. mays	Soil × roots	− 0.9986	p < 0.01	− 0.9966	p < 0.01
		Soil × edible parts	− 0.9999	p < 0.01	− 0.9984	p < 0.01
Cd	L. siceraria	Soil × roots	− 0.9391	p < 0.01	− 0.9961	p < 0.01
		Soil × edible parts	− 0.9698	p < 0.01	− 0.9987	p < 0.01
	A. esculentus	Soil × roots	− 0.7455	p < 0.01	− 0.9982	p < 0.01
		Soil × edible parts	− 0.9030	p < 0.01	− 0.9900	p < 0.01
	Z. mays	Soil × roots	− 0.9502	p < 0.01	− 0.9894	p < 0.01
		Soil × edible parts	− 0.8998	p < 0.01	− 0.9896	p < 0.01
Cr	L. siceraria	Soil × roots	− 0.9900	p < 0.01	− 0.9902	p < 0.01
		Soil × edible parts	− 0.9885	p < 0.01	− 0.9311	p < 0.01
	A. esculentus	Soil × roots	− 0.9829	p < 0.01	− 0.9710	p < 0.01
		Soil × edible parts	− 0.9092	p < 0.01	− 0.8218	p < 0.01
	Z. mays	Soil × roots	− 0.7741	p < 0.01	− 0.9997	p < 0.01
		Soil × edible parts	− 0.7412	p < 0.01	− 0.9992	p < 0.01
Hg	L. siceraria	Soil × roots	− 0.2674	NS	− 0.9977	p < 0.01
		Soil × edible parts	− 0.9394	p < 0.01	− 0.9818	p < 0.01
	A. esculentus	Soil × roots	− 0.9869	p < 0.01	− 0.9547	p < 0.01
		Soil × edible parts	− 0.9909	p < 0.01	− 0.9932	p < 0.01
	Z. mays	Soil × roots	− 0.9332	p < 0.01	− 0.8466	p < 0.01
		Soil × edible parts	− 0.9970	p < 0.01	− 0.8906	p < 0.01

Note: 1. Cd, cadmium; Cr, chromium; Hg, mercury; Pb, lead

2. p < 0.01, significant; NS, not significant