According to Purdue agronomists Jeferson Pimentel and Daniel Quinn, corn planting in Indiana made a rapid jump last week, reaching 30% planted as of April 26, 2026, up from 14% the prior week. That sudden move reflects a widespread window of field-fit conditions that allowed many growers to plant quickly. Fast planting can be advantageous, but yield still depends on achieving uniform emergence across fields.
Growers should watch three immediate field factors: soil temperature at planting, soil moisture and sidewall condition, and short-term weather that could expose emerging plants to cold stress. Calendar date alone does not determine yield; consistent, uniform emergence does. Monitoring stand uniformity in the first weeks after planting will be important for assessing whether replanting or management changes are needed.
Many operations capitalized on early planting opportunities where soils were warm and workable, which explains the sharp week-to-week increase. Equipment crews moving efficiently and contiguous tracts of fit ground drove much of the progress reported across the state.
Flooding risks and timing
Recent heavy storms dropped more than two inches of rain in parts of Indiana, increasing the risk of saturated soils and localized flooding, especially in poorly drained or low-lying field areas. Heavy rainfall and ponding raise concern for young corn and for fields near creeks and river bottoms where water can stand and oxygen in the root zone is rapidly depleted.
Corn younger than V6 (six fully collared leaves) is particularly vulnerable because the growing point remains at or below the soil surface; if that growing point is submerged, plants can suffer fatal damage once soil oxygen is exhausted, often within about 48 hours. Warm air and soil temperatures can accelerate plant respiration and reduce dissolved oxygen in water, so fully submerged plants in warm conditions may not survive one to three days of ponding.
Flooding harms roots and reduces nutrient and water uptake even when plants remain above the waterline, which can reduce ear size and kernel number later in the season. Mud and debris deposited in the whorl can limit photosynthesis and encourage secondary fungal or bacterial disease, and water that reaches developing ears can promote ear rots. Significant rainfall events also increase the risk of nitrogen loss — by leaching on coarse soils or by denitrification in saturated, anaerobic soils — complicating decisions about supplemental nitrogen applications.
Ear rots and management
Not all ear rots produce mycotoxins, but several common U.S. ear rots do pose food-and-feed safety risks. Pathogens that can produce regulated mycotoxins include Gibberella (deoxynivalenol, DON or vomitoxin) and zearalenone, Fusarium (fumonisins), Aspergillus (aflatoxins), and some Penicillium species (associated with ochratoxin in some cases). Other ear rots, such as Trichoderma and Diplodia, mainly reduce test weight and quality without the same toxin risks under typical field conditions.
Management steps when mycotoxin-producing pathogens are suspected include accurate pathogen identification, pre-harvest scouting, and testing grain before storage or marketing. Practices that reduce insect damage, minimize stress at silking, and avoid prolonged wet conditions during grainfill will lower ear rot and toxin risk; non-mycotoxin rots are managed primarily to protect yield and quality. Fields showing clear nitrogen deficiency before pollination are the ones most likely to benefit from supplemental N applications, but estimating exact N loss is complex and depends on source, timing, soil texture and duration of saturation.
To confirm whether flooded or ponded corn has survived, Wait three days after water drains and then check for new leaf growth and the growing point by splitting the stalk; a healthy growing point will be white or cream-colored, while a dead growing point will appear dark and soft.
Image credit: ag.purdue.edu
