Device for observing water content, method for observing water content, and cultivation device

Abstract

A cultivation device for watering plants is provided. The cultivation device includes a light source configured to irradiate a plant and a processor. The processor calculates an amount of water contained in the plant based on reflection light of the light reflected by the plant in a certain measurement period, and irrigates the plant with a predetermined amount of water according to the calculated amount of water contained in the plant.

What is claimed is: 
     
         1 . A cultivation device for watering plants, the cultivation device comprising:
 a light source configured to irradiate a plant with light;   a processor configured to:
 calculate an amount of water contained in the plant based on reflection light of the light reflected by the plant in a certain measurement period; and 
 irrigate the plant with a predetermined amount of water according to the calculated amount of water contained in the plant. 
   
     
     
         2 . The cultivation device according to  claim 1 ,
 wherein the processor calculates the predetermined amount of water to irrigate the plant at a timing when the calculated amount of water contained in the plant becomes a second predetermined amount of water.   
     
     
         3 . The cultivation device according to  claim 2 ,
 wherein the processor sets the timing based on a time transition of the calculated amount of water contained in the plant in the certain measurement period.   
     
     
         4 . The cultivation device according to  claim 2 ,
 wherein the processor determines that the predetermined amount of water for irrigating is optimum when the amount of water contained in the plant is equal to an upper limit value of a predetermined range after dropping water during a searching process for an optimum irrigation amount for watering at the timing.   
     
     
         5 . The cultivation device according to  claim 4 ,
 wherein the processor irrigates the plant with the predetermined amount of water determined to be optimum at the timing.   
     
     
         6 . A method of cultivating a plant by watering the plant, the method comprising:
 irradiating the plant with light;   calculating an amount of water contained in the plant based on reflected light of the light reflected by the plant in a certain measurement period; and   watering the plant with a predetermined amount of water according to the calculated amount of water contained in the plant.