Growth Stage?

[DrWazzock]

I am a bit confused. Wheat. Crispin. October drilled.
I think this is still at GS31 with leaf 3 just beginning to emerge.
Is this right?
There is an extra root node there below ground.

The smallest squares on the graph paper are 2mm, so root to extra root node is about 2 cm etc.

Other plants in the field are similar. I found only one without an "extra root node" and it looked more definitively like classical GS31 with 1st internodal distance >1cm, and second internodal distance <2cm.

Looking in my cereals manual, I find that the distance from root node to "extra root node" is always shown as less than 1cm but in the case above it is greater than 1 cm. This is what confuses me, as my plant doesn't match any of the growth stage determination diagrams.(because the root node to extra root node distance is greater than 1 cm.)

 

[fudge]

It would appear from your photo that you are right to call that GS 31 however it is on the cusp of GS 32, since there is clear separation between the upper 2 nodes.
You can only tell if the emerging leaf is leaf 3 by counting the leaves yet to emerge.
The root node separation doesn’t make any difference to the determination of leaf 3 emergence, IMO that is often related to drilling depth rather than anything else.

 

[Badshot]

I'd say the plant has thrown an extra node due to deeper drilling.
Seen plenty of that here in the past.
Still drill deeper than needed most times

 

[Brisel]

The inter node distance needs to be > 1cm to be noteworthy. Why worry about this? Cut off for some spray products? T1 fungicide needs to be on an unfurling leaf 3 which can happen at any time between GS31 and GS 33 depending on various other factors like sowing date & weather to date.

 

[DrWazzock]

It was drilled a bit deep but at least that kept the rooks off the seed.

The inter node distance needs to be > 1cm to be noteworthy. Why worry about this? Cut off for some spray products? T1 fungicide needs to be on an unfurling leaf 3 which can happen at any time between GS31 and GS 33 depending on various other factors like sowing date & weather to date.

It would appear from your photo that you are right to call that GS 31 however it is on the cusp of GS 32, since there is clear separation between the upper 2 nodes.
You can only tell if the emerging leaf is leaf 3 by counting the leaves yet to emerge.
The root node separation doesn’t make any difference to the determination of leaf 3 emergence, IMO that is often related to drilling depth rather than anything else.

Well I never knew that. So I need to count the leaves yet to emerge to be sure of hitting leaf 3.

Thanks very much.

 

[ollie989898]

The inter node distance needs to be > 1cm to be noteworthy. Why worry about this? Cut off for some spray products? T1 fungicide needs to be on an unfurling leaf 3 which can happen at any time between GS31 and GS 33 depending on various other factors like sowing date & weather to date.

I agree, I would be more inclined to look at the leaves and work out if the leaf is out/on its way out and sequence the fungicide application accordingly- or at least attempt to.

 

[DrWazzock]

Last year I only used the 2nd internode distance being greater than 2 cm and sprayed my T1 on the 7th of May. This turned out to be correct more by luck than judgement maybe, as 2 more leaves did emerge. T1.5 leaf 2 and flag leaf.

 

[DrWazzock]

Best not to slice then but just try to strip back to determine leaf number?

Fingers too big, eyesight too bad, better get the magnifying glass.

What a clat. I'll get there eventually.

 

[Brisel]

Best not to slice then but just try to strip back to determine leaf number?

Fingers too big, eyesight too bad, better get the magnifying glass.

What a clat. I'll get there eventually.

 

[fudge]

Best not to slice then but just try to strip back to determine leaf number?

Fingers too big, eyesight too bad, better get the magnifying glass.

What a clat. I'll get there eventually.

Normally the leaf which is emerging at GS 32 is leaf 3. This bit of short hand gets less reliable as drilling gets early as earlier crops can produce an “extra leaf". For my own crop I go by Gs 32 since it’s all drilled mid Oct onwards. The other half of my flo chart asks me if YR is present. This mornings answer is “yes” so according to me I have no need to wait for leaf 3 to be fully emerged I can spray immediately. Others may differ!

 

[yellow belly]

Best not to slice then but just try to strip back to determine leaf number?

Fingers too big, eyesight too bad, better get the magnifying glass.

What a clat. I'll get there eventually.

I would always peel leaves off as early gs 31 the flag leaf can be missed by cutting open