Corn field guide
Corn responds strongly to a uniform stand, open drainage and timely moisture around flowering.
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Before you begin
- Use a locally recommended sowing window and hybrid
- Start with a soil test and a clear drainage plan
- Keep seed, fertiliser and irrigation channels ready before sowing
Your field timeline
Before sowing
1. Plan the field
Set up the crop for even emergence.
- Prepare a well-drained seedbed and clear runoff channels
- Use soil-test results to plan nutrients
- Confirm local spacing, seed rate and sowing window
Watch for: Low spots where rainwater can stand
Sowing day
2. Sow into moisture
Aim for even depth and good seed-to-soil contact.
- Sow in lines at the locally recommended depth and spacing
- Keep rows visible for weeding and irrigation
- Give only enough irrigation to establish the crop if soil is dry
Watch for: Seed placed too deep or in waterlogged soil
Emergence to knee-high
3. Build a uniform stand
Check germination early and keep competition low.
- Walk rows and mark gaps or weak patches
- Remove early weeds and keep drains open
- Apply nutrients only at locally recommended stages and rates
Watch for: Uneven colour, standing water or wilting
Tasseling and silking
4. Protect flowering
This is a sensitive water stage.
- Check root-zone moisture frequently
- Irrigate before visible stress where rainfall is insufficient
- Scout for insects and disease symptoms while walking the field
Watch for: Rolled leaves, delayed silks or water sitting around roots
Grain filling to maturity
5. Fill grain and harvest
Maintain crop health, then let the field dry safely.
- Avoid prolonged moisture stress during grain filling
- Reduce unnecessary irrigation as the crop approaches maturity
- Harvest when the variety reaches field maturity and grain is suitable
Watch for: Lodging, ear damage and late waterlogging
Watering: read the field, not just the calendar
- After sowing
Seed zone is dry or crusting
Use light, even irrigation; do not flood.
- Knee-high growth
Root-zone soil is drying and leaves lose firmness
Restore moisture and keep drainage channels open.
- Tasseling and silking
No useful rain and soil moisture is declining
Prioritise irrigation; avoid both drought and standing water.
- Grain filling
Crop shows stress before grain is filled
Provide timely moisture, then taper near maturity.
Local conditions come first
Rainfall, soil, sowing date, crop variety and irrigation method can change every recommendation. Use this page as a field checklist, then confirm rates, dates and treatments with your local KVK or agriculture officer. Always follow the product label for crop-protection inputs.