Cold water on seedlings: a stalled paddy is not always hungry
Deep cold water holds the root in a fridge.
- A yellow stalled strip at the inlet; the next rows are greener.
- Cold water on seedlings, not a whole-field hunger.
- Cold-water paddies often ride with phosphorus shortage; the root cause is cold.
- Rusty-water fields are another path; cold water is not always rusty.
- Don’t treat the inlet strip as field-wide nitrogen; don’t irrigate seedlings with dawn-cold water.
- Water temperature: Try not to pour ice-cold water straight on seedlings. Let it see the sun
- Name what you see before you feed.
- If leaves, roots and the surface disagree, stop.
What you see in the field
A yellow stalled strip at the inlet; the next rows are greener. Cold water on seedlings, not a whole-field hunger.Is the soil wet or dry, the root white or black? Wet wilt and a foul root mean drain first. Leaf wilt with white roots may be drought. Smell the root before you irrigate.
Tap to enlarge. The caption says what to photograph. Missing field photos are marked as to-be-added.
Why it looks like this
The field looks like this because the root cannot take water or nutrients the usual way. Fix the soil condition first — drainage, salt, acidity, compaction or a salt of fertiliser — then a thin feed. Rates live in the range on this page; confirm with a local station and the label.
Easy to mix up
Looks like “Phosphorus shortage”
Cold-water paddies often ride with phosphorus shortage; the root cause is cold.
Looks like “Ferrous toxicity”
Rusty-water fields are another path; cold water is not always rusty.
Do this / don’t do that
- 1A yellow stalled strip at the inlet; the next rows are greener. Cold water on seedlings, not a whole-field hunger.
- 2Change the inlet. Don’t pour icy dawn water on seedlings. Reroute or pause. Thin feed only after you know.
- 3Don’t treat the inlet strip as field-wide nitrogen. Use the range on this page only as a range. Confirm with a local station and the product label.
Don’t do this first
- Don’t treat the inlet strip as field-wide nitrogen; don’t irrigate seedlings with dawn-cold water.
Rate range
Water temperature
Try not to pour ice-cold water straight on seedlings
Let it see the sun.
Phosphate fertiliser
Band it, follow a soil test
Cold soil makes phosphorus less available.
These are ranges. Confirm with your local extension station and the product label.
When you see A yellow stalled strip at the inlet; the next rows are greener. Cold water on seedlings, test. Take soil from the bad patch and from a greener neighbour, separately.
Lesson video
2026-03-12 · Li Zeyu · For learning. Serious damage: local agronomist or a soil test.
For learning only. Fertiliser and pesticide decisions need a local agronomist and a soil test.
Not sure? Photograph the field to identify the problem