Regulate OSR Growth

Article taken from the A&I Agriculture and Industry News

Agrovista’s Mark Hemmant told a partnered event with BASF at Stoughton that there are three types of oilseed rape this spring, quick established crops that are running out of steam and declining rapidly, low seed rate crops with good structure and biomass and high seed rate crops which are going to be vulnerable to lodging and shaded canopy issues.

“The main agronomic attention going forward needs to be to minimise pigeon damage, delay nitrogen applications but ensure well-timed sulphur applications and the application of a robust growth regulating fungicide programme.

“The building blocks for good yields are there.  Establishment was good, crops have come through the winter very well so far and for those crops drilled using deeper min-till, rooting looks like it has been strong,” Mr Hemmant explained.

“But, we still have some way to go with many crops certainly lodging-prone.  Also, the excess biomass present in many crops will create shaded canopies with limited branching potential, shown in our Growcrop Gold trials to limit seed set and pod fill.”

Mr Hemmant sees Caryx as an important ally.  “Launched last spring, this is the only plant growth regulator for oilseed rape.  ADAS work has shown that it is very good at reducing lodging risk as well as managing canopies.

“Caryx can only be applied once in a season, so if the target is lodging prevent, applications should be made at stem extension.  For canopy manipulation to improve architecture for light penetration, then applications should be at yellow bud stage along with a strobilurin for sclerotinia management.”

According to manufacturer BASF, Caryx contains metconazole and mepiquat chloride, active ingredients with complementary modes of action and consistent performance, even in low temperatures, and that trials have delivered positive rooting effects and very good crop height reduction.

Mr Hemmant suggested that 1L/ha of Caryx is likely to do a similar job to full rate of metconazole, but that on high-risk, high fertility sites, a full rate of 1.4L/ha would be his recommendation. 

 

14 February 2014

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