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. 2019 Apr 1;9:5443. doi: 10.1038/s41598-019-41807-9

Table 5.

Regression models between the trace metal concentrations in faba bean tissues and soil trace metals, pH and organic matter (OM) content.

Equation R 2 ME MNAE Student’s t-test
t-value P
Roots
Alroot = 95495.319 − 0.153 × Alsoil − 9127.812 × pH + 502.614 × OM 0.742 0.679 0.092 0.497 0.640
Coroot = 60.746 + 0.279 × Cosoil − 6.479 × pH + 1.275 × OM 0.697 0.565 0.080 0.730 0.498
Crroot = 950.114 + 0.160 × Crsoil − 100.887 × pH + 9.341 × OM 0.851 0.870 0.082 0.589 0.581
Curoot = 241.687 + 0.565 × Cusoil − 26.529 × pH + 3.186 × OM 0.909 0.772 0.108 0.021 0.984
Feroot = 56685.860 + 0.082 × Fesoil − 5418.842 × pH + 2080.731 × OM 0.821 0.871 0.046 0.386 0.715
Mnroot = 3514.041 + 0.708 × Mnsoil − 419.334 × pH + 82.070 × OM 0.883 0.911 0.064 0.374 0.723
Niroot = 307.267 + 0.502 × Nisoil − 32.276 × pH − 0.254 × OM 0.825 0.727 0.111 0.679 0.527
Pbroot = 300.588− 0.120 × Pbsoil − 31.583 × pH + 1.707 × OM 0.831 0.846 0.135 1.472 0.201
Znroot = 754.425 + 2.039 × Znsoil − 97.864 × pH + 22.537 × OM 0.902 0.875 0.167 0.120 0.909
Stems
Alstem = 68133.330 + 0.052 × Alsoil − 5937.589 × pH + 11.590 × OM 0.728 0.607 0.068 0.143 0.892
Costem = 168.106 − 0.006 × Cosoil − 14.822 × pH + 0.667 × OM 0.784 0.808 0.044 0.092 0.931
Crstem = 27.879 − 0.004 × Crsoil − 2.429 × pH + 0.099 × OM 0.633 0.321 0.084 1.172 0.294
Custem = 57.995 − 0.095 × Cusoil − 5.993 × pH + 0.425 × OM 0.905 0.842 0.067 0.695 0.518
Festem = 1936.956 − 0.029 × Fesoil − 92.362 × pH + 126.698 × OM 0.788 0.556 0.063 0.515 0.628
Mnstem = 444.211 − 0.010 × Mnsoil − 45.676 × pH + 4.364 × OM 0.887 0.824 0.076 0.267 0.800
Nistem = 204.629 + 0.086 × Nisoil − 17.741 × pH + 0.078 × OM 0.749 0.640 0.058 0.175 0.868
Pbstem = 143.809 + 0.057 × Pbsoil − 12.662 × pH − 0.262 × OM 0.741 0.649 0.064 0.131 0.901
Znstem = 152.111 + 0.270 × Znsoil − 17.912 × pH + 4.377 × OM 0.877 0.864 0.101 0.936 0.392
Leaves
Alleaf = 33467.206 + 0.051 × Alsoil − 1924.219 × pH + 381.985 × OM 0.620 0.344 0.044 0.354 0.737
Coleaf = 37.147 + 0.128 × Cosoil − 0.240 × pH + 3.019 × OM 0.840 0.449 0.032 0.480 0.652
Crleaf = 26.198 + 0.008 × Crsoil − 2.619 × pH + 0.389 × OM 0.766 0.301 0.086 0.292 0.782
Culeaf = 55.449 + 0.135 × Cusoil − 5.665 × pH + 1.010 × OM 0.859 0.711 0.086 0.109 0.918
Feleaf = 7108.198 + 0.004 × Fesoil − 752.985 × pH + 83.436 × OM 0.752 0.298 0.167 1.260 0.263
Mnleaf = 2645.721 + 0.310 × Mnsoil − 308.062 × pH + 25.300 × OM 0.901 0.938 0.062 0.436 0.681
Nileaf = 185.807 + 0.242 × Nisoil − 16.789 × pH − 1.185 × OM 0.862 0.694 0.049 1.116 0.315
Pbleaf = 106.466 − 0.190 × Pbsoil − 8.243 × pH + 1.382 × OM 0.782 0.741 0.029 0.781 0.470
Znleaf = 323.331 + 0.213 × Znsoil − 34.777 × pH + 1.692 × OM 0.873 0.847 0.068 0.673 0.531
Fruits
Alfruit = 3061.626 + 0.026 × Alsoil − 330.410 × pH −78.413 × OM 0.795 0.548 0.285 1.010 0.359
Cofruit = 61.376 − 0.010 × Cosoil − 5.676 × pH − 0.387 × OM 0.696 0.675 0.063 0.753 0.486
Crfruit = 18.351 − 0.006 × Crsoil − 1.802 × pH + 0.475 × OM 0.506 0.405 0.257 0.756 0.484
Cufruit = 79.912 + 0.149 × Cusoil − 7.717 × pH + 0.839 × OM 0.829 0.670 0.059 1.174 0.293
Fefruit = 6102.976 + 0.020 × Fesoil − 709.813 × pH − 34.300 × OM 0.603 0.680 0.459 1.877 0.119
Mnfruit = 773.484 + 0.047 × Mnsoil − 86.666 × pH + 11.810 × OM 0.833 0.858 0.121 1.406 0.254
Nifruit = 54.621 + 0.104 × Nisoil − 6.260 × pH + 0.057 × OM 0.900 0.642 0.112 1.046 0.343
Pbfruit = 18.752 − 0.093 × Pbsoil − 2.072 × pH − 0.501 × OM 0.873 0.489 0.343 0.076 0.942
Znfruit = 302.152 + 0.369 × Znsoil − 32.010 × pH − 2.170 × OM 0.750 0.656 0.079 0.816 0.452

ME: model efficiency, MNAE: mean normalized average error.