highly significantP < 0.012
This correlation was highly significant for both the black soil ( R 2 = 0.296, P < 0.012) and the red soil ( R 2 = 0.562, P < 0.001) (Fig. 1 b).
This correlation was highly significant for both the black soil ( R 2 = 0.296, P < 0.012) and the red soil ( R 2 = 0.562, P < 0.001) (Fig. 1 b).