Arable


Resist temptation for ‘magic potions’ on crops


crops recover, none of which are worthwhile.


IN THE FIELD Growers should be patient and resist the urge to over manage backward crops says Richard Overthrow


M


any growers will still be looking to complete their autumn cere- al planting season – with a rea- sonable percentage of December sown winter wheat in the ground. With guidance from the Rec- ommended List safe sowing dates for wheat, further attempts can still be made. It is very well say- ing spring cereals will perform better if sown now, but seed price and availability understandably means many will stick with plans to sow winter crops.


One bright spot in all this is that these winter-sown winter ce- reals will have a much reduced input requirement – as long as we can resist the pressure to ap- ply ‘magic potions’ to make the


It is also worth stressing that, late sown and backward cereal crops won’t respond to anything applied this month – although they will need fairly prompt fi rst nitrogen applications later to de- ter any tiller loss. It is unlikely that ground con- ditions will allow top dressing an- yway. But any nitrogen applied so far ahead of the start of spring growth will be wasted.


Spring crops


Those planning to grow spring crops, some for the fi rst time, will be preparing soon but Feb- ruary is early enough for any of the crops concerned. Some crops such as spring wheat and barley can be sown this month but only for logistical reasons. Such early sowing will require more management and won’t nec- essarily give higher yield. Spring oats should be held


back until March, or late Febru- ary at the earliest and in any sit- uation where a spring cereal is employed in a grass weed cam- paign, sowing should not be con- sidered for some time: late March onwards is more typical in these cases.


Spring beans can be sown this month as can any leftover sow- ings of winter beans.


Sray applications.


Growers with well-established winter cereals may still have outstanding applications of grass


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Many crops are still standing in waterlogged fi elds


weed herbicides such as Broad- way Star, or black-grass products such as Hamlet or Atlantis. These should be applied sooner rather than later so look out for suitable weather windows.


Better opportunities will come along later in spring but the tar- get weeds will be bigger and more diffi cult to control. If targeting known spring germinators such as meadow brome, however, some delay may be necessary to allow the weed population to appear. There may also be applications of propyzamide or carbetamide to go on oilseed rape, particularly where the fate of the crop has only


Timely tips


• Don’t sow spring cereal crops too soon


• Consider sowing spring or winter beans


• Hold back from sowing spring oats


• Tackle target weeds in winter cereals


• Continue watching for light leaf spot


recently be determined. Remem- ber the cut-off is the end of Janu- ary for Kerb and Astrokerb, and the end of February for Crawler.


Fresh infections Oilseed rape crops may still show fresh infections of phoma. But any infections developing now are unlikely to affect yield because there won’t be suffi cient time to form signifi cant stem cankers. But mild and wet periods from now on may encourage light leaf spot – so further treatment for this cannot be ruled out at or even before stem extension. Some oilseed rape crops have established and grown well so can soon be examined to determine canopy size, with a view to fu- ture fertiliser management. Most crops will have no such concerns, however, with canopies that are plenty small enough. The priority with these is to get some nitrogen and sulphur on next month, to aid their fur- ther recovery as spring beckons.


› Richard Overthrow is a region- al agronomist with NIAB TAG, the UK’s largest independent agrono- my organisation with several re- search centres in East Anglia. For more details, call 01223 342495.


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