Replant corn – How to decide.

This year we had some fields that were planted early and then went thorugh a very wet, cold period and now the emergence is less than desirable in some areas of the field. Do I replant the poor sections, or the whole field (with the price of corn this would be a very costly option), do I leave it alone, these are all very good questions.

Corn replant decisions are difficult. The following table can be utilized as a guideline when assessing yield potential at various planting dates and populations. In general it doesn’t pay to replant corn where populations of healthy plants are greater than 18,000 plants per acre
.

First we need to establish the population that has emerged. You can do this by counting the number of plants in 1/1000 of an acre (see chart). Do this a number of times in the field. Also, assess the cause of reduced emergence using the following checklist.

 Rotted seed or seedlings
 Sprout twisted or leaves expanded underground
 Seeds hollowed out (insect damage)
 Check seed intactness (firmness)
 If seed is watery or “yellowy pus” it is not going to emerge
 Do not worry about crooks or turns of the coleoptile (shoot) as it may be responding to the seed orientation (corn seed does have an up and down side); also, cold soil will often disorient coleoptile growth.

As this is a very difficult decision please contact your NK field representative or seed dealer if you have any questions.

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