Table 5: The regression coefficient (), standard error (SE), value, and probability of the estimated variables in predicting wheat grain yield by the multiple linear regression analysis under inoculation (In) and noninoculation (non-In) conditions and different water levels.

Predictor   DF SE Constant In 1 0.5394 0.49180 1.10 0.284 Non-In 1 −0.0893 0.20870 −0.43 0.672 X1 In 1 −0.1164 0.08245 −1.41 0.171 Non-In 1 −0.0061 0.04145 −0.15 0.884 X2 In 1 −0.0202 0.05014 −0.40 0.691 Non-In 1 −0.0103 0.02030 −0.51 0.618 X3 In 1 −0.0082 0.02037 −0.40 0.693 Non-In 1 0.0032 0.01477 0.22 0.830 X4 In 1 0.9617 0.01927 49.90 0.001 Non-In 1 0.9780 0.01041 93.96 0.001 X5 In 1 0.0110 0.00699 1.56 0.131 Non-In 1 0.0120 0.00389 3.07 0.005 X6 In 1 −0.7802 0.34490 −2.26 0.033 Non-In 1 −1.5139 0.24110 −6.28 0.001 X7 In 1 −0.0070 0.00979 −0.71 0.483 Non-In 1 −0.0045 0.00538 −0.84 0.411 X8 In 1 −0.0042 0.00318 −1.33 0.196 Non-In 1 −0.0032 0.00196 −1.61 0.120 X9 In 1 0.0131 0.01165 1.12 0.273 Non-In 1 −0.0109 0.00541 −2.01 0.056 X10 In 1 0.0840 0.09246 0.91 0.373 Non-In 1 0.1195 0.05402 2.21 0.037 X11 In 1 −0.0008 0.00318 −0.25 0.803 Non-In 1 0.0049 0.00177 2.74 0.011

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.