Water content observation device, moisture content observation method and cultivation device

摘要

To flexibly control the amount of moisture contained in plants including fruits such as tomato, taking into account the influence of surrounding environmental conditions.A first projection light source irradiates a leaf of a plant with 905 nm near infrared light having characteristics hard to be absorbed by moisture as a reference light. The second projection light source irradiates the leaves of the plant with near-infrared light of 1550 nm having characteristics that are easily absorbed by moisture as measuring light. The threshold setting / moisture index detection processing unit calculates the sum total Ln (I₉₀₅/ I₁₅₅₀) To calculate the moisture index of one leaf. The control unit is connected to a control device 200 for controlling the environmental conditions around the plant and instructs the control device 200 to change or maintain the environmental condition based on the change in the amount of moisture contained in the calculated plants.(FIG.