Grains

Mean value

Leaves

Mean value

t

DF

Significance (2-tailed)

Mean Difference

Zn

0.122

0.115

0.655

34

0.517

1.389

Cd

0.009

0.011

1.506

34

0.141

0.333

Cu

0.111

0.117

0.867

34

0.392

1.167

Co

0.041

0.041

0.222

34

0.826

0.111

Pb

0.321

0.323

0. 129

34

0.898

0.500