Construction of a Ginseng Root-Meristem Sensor and a Sensing Kinetics Study on the Main Nitrogen Nutrients.

The sensing sensitivity of ginseng to urea showed an increasing trend (urea: Ka = 3.333 × 10 −22 mol/L; sodium nitrate: Ka = 6.529 × 10 −24 mol/L) in the first four years and then showed a decreasing trend after four years, and the sensing sensitivity of six-year-old ginseng was relatively low (9.970 × 10 −21 mol/L).

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