PTU Calculator

Photo thermal units (PTU) is calculated by using the equation given by Wilsie (1962)

Where,
GDD = Growing degree days
L = Maximum possible sunshine hours

Dates of sowing plays a major role in the accumulation of GDD and PTU from sowing to maturity of crop. GDD and PTU could also be used as tool for recommending sowing period for a specific crop.

Start Date
End Date
 Use map to select        
       
 
Enter GDD Base Temperature: °C ( We will type the integer value of max 2 digits only)
         
(Example:  Pl.  Enter 20 o F and calculate & see the graph  and data  displayed,  we need same way in o C)
         
CALCULATE   REMOVE  ANATONE STATION
     
  Anatone 2014      HUE: x.xxx g/GDD
     
GRAPH   Date vs  PTU    
Jan 01-Jan 16

Year

PTU for base temp= 20°F

 

2014

X1

Current (graphed by default)

2013

X2

Minimum (graphed by default)

2012

X3

Show 2012 on graph

2011

X4

Show 2011 on graph

2010

X5

Maximum (graphed by default)

Average

Average X