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Crop Heat Units (CHUs) Corn 2025

Location Crop Heat Units as of May 1st 2025 CHU accumulation last year 
Harrow                                                                    
Ridgetown                                                                         
London                             
Sarnia                                                                

2025 CHU accumulations will commence on May 1, 2025. 

FYI , So far in April, from 1st to 22nd  at Harrow we have accumulated 108 CHU compared to a year ago of 136 . It takes 160  CHU for emergence to occur.   

Growing Degree Days Winter Wheat Development January 2025 and forward

Location Growing Degree Day accumulation as of January  1st 2025 GDD accumulation last year 
Harrow 346 445
Ridgetown 301 428
London 247 368
Sarnia 300 418


 Updated April 22, 2025

It would appear ECCC has recalibrated weather station data and adjusted the GDD accumulation. This is more in line with what we are seeing in the change in wheat growth. Stem elongation is likely occurring now,  field conditions will dictate N and S applications. 



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