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Crop Heat Units (CHUs) Corn 2024

Location Crop Heat Units as of May 1st 2024 CHU accumulation last year 
Harrow 1172                   954
Ridgetown 1102                    866
London 1099                                
Sarnia 1046                      799

Updated June 23, 2024 -   A much warmer start than last May. It takes 70 to 80 CHU for each new leaf to develop. Corn Nitrogen sidedressing is well underway on late April, early May planted corn. Corn planted in early May is in V7 to V9 growth stage 

Growing Degree Days Winter Wheat Development 2024

Location Growing Degree Day accumulation as of january 1st 2024 GDD accumulation last year 
Harrow 1549 1293
Ridgetown 1448 1202
London 1394 1274
Sarnia 1407 1157

Updated June 23, 2024.  Weather station data is always calibrated, verified and adjustments  made to recorded temps which is why measurements  can change slightly over time. 

Growing Degree Days (GDD)  is a thermal, time measurement that allows us to track the intervening time between critical growth stages. GDD is calculated by taking the average of the high and low temperature in C for each day with a base temperature of 0 C. ( temperatures calculated  below 0 do not count) 

Grain fill is underway,  it takes 660 GDD to complete this stage   Early planted wheat as of  June 23 has possibly 4 to 5 days of grain fill left. Looking like a 33 to 34 day grain fill period. 

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