Effects of Soil Properties on Pb, Cd, and Cu Contents in Tobacco Leaves of Longyan, China, and Their Prediction Models

Table 5

Prediction models of Pb, Cu, and Cd in tobacco leaves.

Item	Multiple regression equation	R
Pb		0.802	0.787	<0.001
Cd		0.901	0.891	<0.001
Cu		0.733	0.724	<0.001

Note. K: available potassium; N: alkali-hydrolyzable nitrogen; P: available phosphorus; OM: organic matter; , , and represent the metal content of Pb, Cd, and Cu in soil; in the prediction model of Cd, denotes the metal concentration of Cu in soil.