The first 30% of Southwestern Ontarios earliest planted corn acreage ( that planted between April 25 and May 10th ) will be coming into tassel within 8 to 13 days time - somewhere in the July 21 - 26 time frame.These fields are in the 14th - 16th true leaf stage today.Yield parameters such as number of rows around the cob and the number of kernels for the length of cob have already been set.