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S Illinois | You have much better temps for grain fill is the primary reason for those yield levels despite shorter season corn. Even full season 120 day corn can’t overcome high nighttime temp induced respiration rates. So even further south where GDU’s are plentiful, fuller season corn doesn’t gain more yield.
Most soils can hold 10-12” of plant available moisture in the subsoil. Once to field capacity(much less than saturated/standing water level) no extra moisture provides a benefit and actually is a detriment to root growth. So the only moisture available back east is 10-12” of subsoil moisture and then what falls during the growing season and even then it will depend if the soil can hold more at the time of rainfall. Many years the rainfall in May in IL provides little yield contribution. Total yearly amount means little. Distribution across the year is much much more important.
Edit: Soybeans are the opposite and those further south will always be able to grow much better beans than those up north. Give me heat and moisture in Aug-Sept for soybeans. Unfortunately not what corn needs.
Edited by w1891 11/9/2023 18:30
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number report?
