What is wrong with this?

[Brisel]

I'm not hugely concerned but am curious to know why some of my osr has the leaves curling up a bit?

It is due its first dose of N later this week and had a litre of Fox + a litre of oil 6 weeks ago for charlock. It is home saved Picto.

 

[spin cycle]

looking at the AI...bifenox...i'd say touch of herbicide damage

 

[Ugo79]

Did it have Centurion Max (or equivalent) in the autumn for grass-weeds?

 

[Outsiderofthree]

If it is just the odd plant next to healthy ones, pull up the roots to check for club root.

 

[Brisel]

Did it have Centurion Max (or equivalent) in the autumn for grass-weeds?

Generic Falcon in October and full rate Astrokerb in early December with 0.4 Proline for phoma/LLS.

If it is just the odd plant next to healthy ones, pull up the roots to check for club root.

Did that - no clubroot thankfully. It was quite regular across the field on varying soil types. Plenty of moisture there but no waterlogging.

 

[Kidds]

Aphid is my first thought.

 

[Chalky]

cupped leaves, looks like boron deficiency. You are on high pH chalk, if leaves brittle-that is my guess.

 

[Will7]

I am going for fox damage. It looks the same to what I have had here before, the agronomist thought it was molybdenum deficiency, but tissues tests were fine. It will recover but will look worse in the short term.

On the plus side it will probably curl up the intended target as well!!

 

[Brisel]

cupped leaves, looks like boron deficiency. You are on high pH chalk, if leaves brittle-that is my guess.

Hmm. Not sure but I'll have a look for the brown lesions on the stem base. It will be due a dose of teb in a few weeks & I normally add at least a litre of Solubor. You're right - the risk of boron deficiency is there.

http://www.yara.co.uk/crop-nutritio...cies/b/4690-boron-deficiency---oil-seed-rape/

 

[Chalky]

The deficiencies I normally expect seem worse than ever this year. Always expect Mg, B, Zn(Mn) in OSR with our high pH soils-but not normally as bad, as early. Normally exacerbated in mid stem-high growth, rather than at the early Feb timing we first tissue test at. Mg especially low on tests here. Will have to see where cereals are in a week or two, but expecting Mg, Cu, Zn & Mn.

Luckily the micronutrients are fairly cheap(and easy) to sort, Mg is a season long job. I think we use at least 10T of Bittersalz per annum here.

 

[Flat 10]

The deficiencies I normally expect seem worse than ever this year. Always expect Mg, B, Zn(Mn) in OSR with our high pH soils-but not normally as bad, as early. Normally exacerbated in mid stem-high growth, rather than at the early Feb timing we first tissue test at. Mg especially low on tests here. Will have to see where cereals are in a week or two, but expecting Mg, Cu, Zn & Mn.

Luckily the micronutrients are fairly cheap(and easy) to sort, Mg is a season long job. I think we use at least 10T of Bittersalz per annum here.

I have high pH chalk here so suffer similar problems. What is your preferred source of Cu and Zn please? Slather liq Mn on and bittersalz but need to look at Cu especially more closely.

 

[Reg]

My Picto looks the same. It's been like it for around 10 weeks. It had Astrokerb at the end of November which I think is the reason. Had Centurian max mid October. Slightly worse on overlaps. It's not on land you would expect deficiencies on. I dont it will do it much harm.

 

[Brisel]

The deficiencies I normally expect seem worse than ever this year. Always expect Mg, B, Zn(Mn) in OSR with our high pH soils-but not normally as bad, as early. Normally exacerbated in mid stem-high growth, rather than at the early Feb timing we first tissue test at. Mg especially low on tests here. Will have to see where cereals are in a week or two, but expecting Mg, Cu, Zn & Mn.

Luckily the micronutrients are fairly cheap(and easy) to sort, Mg is a season long job. I think we use at least 10T of Bittersalz per annum here.

What are your soil Mg indices? Would an ibc of manganese nitrate or kieserite top dressing not be easier?

 

[Chalky]

On OSR this year using KornKali (K, Mg & S)sometime in March- fresh spring potash also showing responses, even though decent indices, and work suggesting SO3 rates required are climbing year on year.

Mg is a 2, but availability does not mirror the indices.

 

[Brisel]

What kind of yields do you get from osr?

 

[Chalky]

rolling average 4.5-4.8 t/ha. Cannot profess to be in the 5 Tonne club! 2016 was at the bottom end of that range.

 

[Flat 10]

On OSR this year using KornKali (K, Mg & S)sometime in March- fresh spring potash also showing responses, even though decent indices, and work suggesting SO3 rates required are climbing year on year.

Mg is a 2, but availability does not mirror the indices.

as above what are you using for Cu and Zn?

 

[Chalky]

Use Yara micronutrients-by far the least troublesome residue wise we have tried. Headland products always used to give us grief.

Cereals Mancozin & bortrac if B low(as it was last year). Boost Mn with solid MnSO4 at GS30. OSR will use similar & Bola for Boron most likely

 

[Barry]

If I remember rightly some varieties have been a bit sensitive to Fox and it may be related to the amount of wax on the leaves. But I don't recall any being singled out recently..

 

[Brisel]

rolling average 4.5-4.8 t/ha. Cannot profess to be in the 5 Tonne club! 2016 was at the bottom end of that range.

That's pretty respectable. I'm averaging a tonne less than that! Tissue testing is something I'm a little wary of in case it throws up transient deficiencies that don't really need correcting. That photo was taken on land with a pH of 8.2 and SOM of 5.4% so that suggests a lack of availability for lots of nutrients. I routinely apply boron with the stem extension tebuconazole & 20 t/ha sewage cake is applied 1 year in 3 so available P shouldn't be too much of an issue. I use variable rate Fibrophos to top up hot spots - this field had a biennial dose of high K Fibrophos pre drilling.

Did you do any trials on part fields where you didn't apply any top ups to see if there was a yield penalty?