Application of Electrical Capacitance Method for Prediction of Plant Root Mass and Activity in Field-Grown Crops.

Statistical analysis ( t -test) showed highly significant ( p < 0.001) changes in C R * between any two consecutive measurement times.

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The effect of AMF treatment was visible in the root capacitance response (Figure 5 ): according to t -tests, the mean C R * of AMF-inoculated plants was significantly higher than that of the control at the 4-node stage (DAS 54; CON : 7.20 ± 0.63 nF; INO : 7.55 ± 0.64 nF; p < 0.01) and at the beginning of flowering (DAS 69; CON : 12.21 ± 0.85 nF; INO : 12.55 ± 0.70 nF; p < 0.05), while borderline significance was observed at the main flowering period (DAS 83; p = 0.063).

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Both growth chamber and field data showed a trend of decreasing hydraulic conductance and photosynthetic activity in aging soybean leaves (Locke and Ort, 2014 ), which was obviously associated with a reduced root water uptake rate.

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