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Crop Heat Units (CHUs) Corn 2025

Location Crop Heat Units as of May 1st 2025 CHU accumulation last year 
Harrow        3094 3284
Ridgetown        2837                                                                                                          3099
London        2833                                                3044
Sarnia        2832                                                                                   3117                     

Updated  September 12, 2025 








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 1779 1953
Ridgetown 1520 1739
London 1592 1785
Sarnia 1625 1854


 Updated July 12,  2025

We will stop reporting GDD for wheat  as of today. Physiological maturity as been reached in most fields in our region.  Grain fill was shortened to 32 days instead of anticipated 34. The accumulated heat in early July brought on the maturity faster.  Impact on yield remains to be seen, yield components  of number of heads and kernels per acre are unaffected by late accumulation of heat,  but kernel mass is most affected.  

 

Harvest has started in Essex County and is advancing slowly east into Chatham and Ridgetown areas. Quality has been good, Falling Numbers range from 380 to 405.  


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