Table 4: Path coefficient (direct and indirect effects) of the measured variables attributed on grain yield variation of wheat in noninoculation condition and different water levels.

Variables Effects via Direct effect Indirect effect Y X1 X2 X3 X4 X5 X6 X7 X8 X9 X10 X11 X1 −0.004 −0.003 0.000 0.503 0.018 −0.03 −0.006 −0.017 −0.019 0.01 0.01 −0.004 0.471 0.467 X2 −0.002 −0.004 0.000 0.495 0.018 −0.026 −0.004 −0.013 −0.019 0.009 0.007 −0.004 0.469 0.465 X3 −0.002 −0.002 0.001 0.641 0.019 −0.028 −0.006 −0.012 −0.018 0.009 0.013 0.001 0.620 0.621 X4 −0.002 −0.002 0.000 1.013 0.018 −0.037 −0.005 −0.012 −0.019 0.012 0.018 1.013 −0.02 0.993 X5 −0.002 −0.003 0.000 0.576 0.032 −0.041 −0.004 −0.015 −0.02 0.01 0.016 0.032 0.522 0.554 X6 −0.002 −0.002 0.000 0.567 0.02 −0.067 −0.003 −0.008 −0.015 0.01 0.02 −0.067 0.591 0.524 X7 −0.003 −0.002 0.000 0.579 0.016 −0.026 −0.008 −0.015 −0.015 0.012 0.013 −0.008 0.563 0.555 X8 −0.003 −0.002 0.000 0.54 0.021 −0.023 −0.006 −0.023 −0.021 0.009 0.011 −0.023 0.532 0.509 X9 −0.003 −0.003 0.000 0.727 0.023 −0.036 −0.005 −0.017 −0.027 0.011 0.013 −0.027 0.716 0.689 X10 −0.002 −0.002 0.000 0.616 0.017 −0.034 −0.005 −0.011 −0.015 0.020 0.013 0.020 0.581 0.601 X11 −0.002 −0.001 0.000 0.673 0.018 −0.048 −0.004 −0.01 −0.014 0.009 0.028 0.028 0.626 0.654

X1: tiller numbers/plant, X2: spike length, X3: spikelets/spike, X4: spike weight/plant, X5: grains/spike, X6: grain weight/spike, X7: 100-grain weight, X8: total chlorophyll content of flag leaf, X9: biological yield/plant, X10: root weight, and X11: leaves area.