Submitted by John Heard, Soil Fertility Specialist, Manitoba Agriculture
Already we are hearing of spotty emergence with cereal crops in Manitoba. Possible culprits may be dry seedbeds, poor quality seed, seed depth, herbicide residues, or seed placed fertilizer injury.Past Prairie studies suggested a 15% stand reduction was tolerable for cereals since surviving plants tillered and filled in the stand. But maturity is less uniform and is delayed up to 4 days.
How might one confirm seedplaced fertilizer injury? Close inspection can show a range of symptoms:
1. Seeds that imbibed water but did not develop any root or shoot
2. Seeds that developed shoots but no roots
3. Seeds that developed root and shoot but leafed out below ground
4. Those that did germinate and emerge (about 44%) were ½ to 1 full leaf stage behind normal seedlings in the low fertilizer strip.
In other crops injury can show as:
Canola – seeds just do not germinate and remain intact. Fields simply appear to have very poor crop establishment.
Soybeans – stands may be injured, especially with wider row spacing and on sandy soils under dry conditions.
For more information, see the full .pdf document on Manitoba Agriculture Current Crop Topics – What Does Seedplaced Fertilizer Injury look like in Cereals