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Simplifying Replant Decisions

Categories: PLANTING, CORN
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  • Remote sensing data collection with Golden Harvest and DroneDeploy software make stand assessment quicker and easier.

  • The Golden Harvest® Corn Replant Calculator helps when choosing between keeping a reduced stand and replanting at specified dates.

  • There may not be a need to switch to earlier relative maturity (RM) hybrids with April and May replant dates.

Less-than-optimum final stands or variable emergence of corn can greatly influence yield potential. Replanting at a later calendar date can also have reduced yield potential and additional associated costs. Replant management decisions should be based on good information. Utilize these steps when considering replanting:

Stand Count Report example that incorporates DroneDeploy software
Figure 1. Example stand count report utilizing drone technology

Determine Existing Plant Stand

Table showing length of row based on various row spacings
Table 1. Length of row equivalent to 1/,1000th of an acre at various row spacings

To estimate the stand, count the number of healthy plants in a length of row that equals 1/1,000th of an acre (Table 1) and multiply the number of plants by 1,000. Take several counts throughout the field to get an accurate final stand. If stand loss is occurring in distinct zones, focus stand count measurements only in those areas of replant consideration. A newer alternative to manually scouting fields is to leverage remote sensing to quickly collect field data and identify areas where stand establishment was a problem. Golden Harvest and DroneDeploy have partnered to deliver real-time estimates of established stands using drone imagery collected by local Golden Harvest agronomists. DroneDeploy software can accurately estimate the number of plants and skips per acre anytime between the V2-V5 corn and soybean growth stages and generate customized reports (Figure 1) to determine approximate stand counts and variation in plant establishment across a field.

Estimate Replant Yield Potential and Compare to Potential of Existing Stand

Previous Golden Harvest planting date trials have been used to estimate the percent yield potential of delayed planting dates compared to retaining a reduced stand from an earlier planting date (Table 2). Additional factors contribute to a replant decision, such as crop insurance, the cost of replant seed, seed availability, potential pest problems, N program, cost arising from higher grain moisture at harvest and more. The cause of the original stand loss is also important. If the poor stand is due to fertilizer injury, herbicide injury, disease or insect infestation, there is potential for the replanted crop to also be affected. To simplify decisions, Golden Harvest has created a Corn Replant Calculator that compares all input costs, as well as yield loss assumptions, using state university data specific to local areas.

Percent yield potential of corn by emerged stand and planting date based on Northern and Southern Corn Belt Trials
* Results best indicate performance in yield environments of 150 bu/A or more with uniform seed spacing
Table 2. Percent yield potential

Decide if RM should be Reduced for Replant

Once the decision to replant corn has been made, selecting the RM of the new hybrid is important. Choose a hybrid that can reach maturity prior to the first frost. Although the growing season has been shortened in replant situations, hybrids compensate for planting date and will reach black layer within fewer growing degree units than if planted earlier. There may not be a need to switch to earlier maturing hybrids since the increased yield potential of a fuller season hybrid typically outweighs costs of drying grain. If grain drying is not an option, slight reductions in RM may be advisable. Based on drying costs, expected yield and corn prices, suggestions based on Golden Harvest Agronomy Research trials are:

  • Plant full-season hybrids adapted for a given area until the last week in May.

  • Change to a mid-season hybrid (4-7 RM earlier than full-season hybrid) if planting in the last week in May.

  • Never switch to hybrids 8-11 RM earlier than adapted full-season hybrid unless drying grain is not an option.

Visit Golden Harvest’s Corn Replant Calculator to enter your unique information and quickly understand if replanting will result in yield and economic benefits in your operations.

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Performance assessments are based upon results or analysis of public information, field observations and/or internal Syngenta evaluations.

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