Patent ID: 11944048
Assignee: CHINA INSTITUTE OF WATER RESOURCES AND HYDROPOWER RESEARCH
Field: Measurement (Instruments)
Classification: CPC A  G | IPC A  G

Claim 8:
9. The decision-making method according to claim 8, wherein
in both step A62 and step B62, a method for determining the sampling time interval of the canopy temperature comprises:
determining the sampling time interval of the canopy temperature based on a criterion that the number of the scattered point values is in a range of 162-572;
in both step A64 and step B64, the normalized relative canopy temperature NRCT is calculated according to the following formula:, N
    ⁢
    R
    ⁢
    C
    ⁢
    T
   
   =
   
    
     T
     -
     
      T
      min
     
    
    
     
      T
      max
     
     -
     
      T
      min
     
    
   
  
  ;
 

wherein, T represents a canopy temperature of each measurement point in the field after the time scale conversion, Tmax represents a maximum canopy temperature of the field after the time scale conversion, and Tmin represents a minimum canopy temperature of the field after the time scale conversion;
in step A67, the water requirement ETc of the crop in the interval between the two irrigation times is calculated according to the following formula:

ETc=Kc×ET0;

wherein,, E
    ⁢
    
     T
     0
    
   
   =
   
    
     
      
       0
       .
       4
      
      ⁢
      0
      ⁢
      8
      ⁢
      
       Δ
       ⁡
       (
       
        
         R
         n
        
        -
        G
       
       )
      
     
     +
     
      γ
      ⁢
      
       
        9
        ⁢
        0
        ⁢
        0
       
       
        T
        +
        
         2
         ⁢
         7
         ⁢
         3
        
       
      
      ⁢
      
       
        u
        2
       
       (
       
        
         e
         s
        
        -
        
         e
         a
        
       
       )
      
     
    
    
     Δ
     +
     
      γ
      ⁡
      (
      
       1
       +
       
        
         0
         .
         4
        
        ⁢
        3
        ⁢
        
         u
         2
        
       
      
      )
     
    
   
  
  ,, ET0 represents a reference evapotranspiration of the crop, Dc represents a crop coefficient, Rn represents a net radiation at a surface of the crop, G represents a soil heat flux density, γ represents a psychrometric constant, T represents a mean daily air temperature at a 2-meter height, and u2 represents a wind speed at the 2-meter height, es represents a saturation vapor pressure, ea represents an actual vapor pressure, and Δ represents a slope of a saturation vapor pressure curve;
in step A67, the irrigation water quota I1 in each of the low-water deficit dynamic management zone, the medium-water deficit dynamic management zone and the high-water deficit dynamic management zone is calculated according to the following formula:, {
  
   
    
     
      
       
        I
        1
       
       =
       
        1
        ⁢
        00
        ⁢
        %
        ⁢
           
        
         ET
         c
        
       
      
     
     
      
       
        
         0
         .
         6
        
        ⁢
        7
       
       <
       
        N
        ⁢
        R
        ⁢
        C
        ⁢
        T
       
        
       ≤
       
        1
        .
        0
       
      
     
    
    
     
      
       
        I
        1
       
       =
       
        67
        ⁢
        %
        ⁢
           
        
         ET
         c
        
       
      
     
     
      
       
        
         0
         .
         3
        
        ⁢
        3
       
       <
       
        N
        ⁢
        R
        ⁢
        C
        ⁢
        T
       
        
       ≤
       
        
         0
         .
         6
        
        ⁢
        7
       
      
     
    
    
     
      
       
        I
        1
       
       =
       
        33
        ⁢
        %
        ⁢
           
        
         ET
         c
        
       
      
     
     
      
       0
       ≤
       
        N
        ⁢
        R
        ⁢
        C
        ⁢
        T
       
        
       ≤
       
        
         0
         .
         3
        
        ⁢
        3
       
      
     
    
   
   ;
  
 

in step B68, the corrected irrigation water amount Im is calculated according to the following formula:, {
  
   
    
     
      
       
        I
        m
       
       =
       
        1
        ⁢
        0
        ⁢
        0
        ⁢
        %
        ×
        
         I
         ′
        
       
      
     
     
      
       P
       <
       
        10
        ⁢
           
        mm
       
      
     
    
    
     
      
       
        I
        m
       
       =
       
        8
        ⁢
        0
        ⁢
        %
        ×
        
         I
         ′
        
       
      
     
     
      
       
        10
        ⁢
           
        mm
       
       ≤
       P
       <
       
        50
        ⁢
           
        mm
       
      
     
    
    
     
      
       
        I
        m
       
       =
       
        6
        ⁢
        0
        ⁢
        %
        ×
        
         I
         ′
        
       
      
     
     
      
       
        50
        ⁢
           
        mm
       
       ≤
       P
      
     
    
   
   ;
  
 

wherein, P represents a rainfall amount from a weather forecast for next 3 days, and I′ represents the preliminary irrigation water quota; and
in step B69, the irrigation water quota I2 in each of the low-water deficit dynamic management zone, the medium-water deficit dynamic management zone and the high-water deficit dynamic management zone is calculated according to the following formula:, {
  
   
    
     
      
       
        I
        2
       
       =
       
        1
        ⁢
        00
        ⁢
        %
        ⁢
           
        
         I
         m
        
         
       
      
     
     
      
       0.67
       <
       
        NR
        ⁢
        C
        ⁢
        T
       
        
       ≤
       
        1
        .
        0
       
      
     
    
    
     
      
       
        I
        2
       
       =
       
        67
        ⁢
        %
        ⁢
           
        
         I
         m
        
         
       
      
     
     
      
       0.33
       <
       
        NR
        ⁢
        C
        ⁢
        T
       
        
       ≤
       
        
         0
         .
         6
        
        ⁢
        7
       
      
     
    
    
     
      
       
        I
        2
       
       =
       
        33
        ⁢
        %
        ⁢
           
        
         I
         m
        
         
       
      
     
     
      
       0
       ≤
       
        NR
        ⁢
        C
        ⁢
        T
       
        
       ≤
       
        
         0
         .
         3
        
        ⁢
        3
       
      
     
    
   
   .