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Plot Prospects 7: February drilled wheat plots have varying degrees of vernalisation

In conjunction with Bayer we will be keeping track of winter wheat crop development this season as emergence is likely to be variable following the challenging conditions.

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Nelson winter wheat at Hinton Waldrist, Oxfordshire.
Nelson winter wheat at Hinton Waldrist, Oxfordshire.

It was likely that the later drilled winter wheat plots at Hinton Waldrist would not fully vernalise, and that has proved to be the case.

 

All February drilled plots have varying degrees of vernalisation, the number of ears that have formed depends on the variety and how far into the month it was drilled. One potential surprise is Nelson – a variety noted for a drilling window as wide as September to the end of February. Even early drilled February plots have incomplete ear emergence, despite stems extending.


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Emergence

 

KWS Extase fared a little better than most but site manager Ben Giles suggests it is better to err on the side of caution when it comes to latest sowing dates.

 

Another interesting aspect with Extase was the short interval between leaf emergence over different drilling dates. Leaf 3 emergence between late October and late November drilled plots was only six days apart, flag leaf emergence less at just three.

Disease

 

The trial also highlighted that drilling date does have a bearing on yellow rust severity, as later drilled untreated JB Diego plots are carrying more of the disease than earlier drillings. However, all treated plots are clean regardless of what azole and SDHI combinations were used.

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