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提出用植株生理电阻的变化反映干旱造成植株体液浓度的改变，得出生理电阻Ｒ＝４０～５０ｋΩ时玉米水分适宜，或植株生理电阻亏缺指数ＲＳＩ≥０．２０时玉米水分亏缺．必须灌水．并用套针式点电阻传感器诊断玉米亏水．
It is proposed that the change of plant physiological resistance reflects the change of body fluid concentration caused by drought, and the suitable moisture of the plant when physiological resistance R = 40 ~ 50kΩ or the water deficit of corn when RSI≥0.20. Must be irrigated. Diagnose corn water loss with trocar point resistance sensor.