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Crop Heat Units (CHUs) Corn 2025

Location Crop Heat Units as of May 1st 2025 CHU accumulation last year 
Harrow             163                                                          188
Ridgetown             148                                                                  173
London             158                    175
Sarnia             121                                                             153

Updated May 14, 2025 

April 1 to April 30 we have accumulated 221 CHU compared to a year ago of 248. It takes 160  CHU for emergence to occur.  Corn planted on April 22 is emerging after 165 CHU accumulated  

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 602 721
Ridgetown 536 689
London 496 627
Sarnia 516 665


 Updated May 14, 2025

Most wheat has flag leaf emerging stop herbicide spraying.  


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