Faulty compost scuppers tomato trials

Failure of two tomato trials at RHS Wisley attributed to issues associated with growing media used for this year's tests.

Composted green waste lacking phosphate has caused the abandonment of a tomato trial at RHS Wisley.

RHS trials development manager Mark Heath said two RHS tomato trials failed this year because of issues with growing media. Rosemoor trials failed because gardeners used manure contaminated with herbicide on border soil. Both will rerun in 2013, possibly without using peat-free compost at all.

Wisley tomato trials failed because of phosphate deficiency in bagged consumer compost used for growing 30 varieties sent in by breeders and suppliers.

Heath refused to name the supplier of the commercially available peat-free compost. He said tomatoes at Wisley had gone blue and had poor leaf growth.

Newly appointed Heath, who used to work for Sakata in Holland, said: "We will be wary of using the product again. Everyone is saying peat-free composts aren't very good for tomatoes. There's a huge debate concerning peat, but it's only in the UK, which is farcical." He added: "This was a peat-free compost for tomatoes that we put our faith in, but it hasn't come off."

Suttons horticultural manager Tom Sharples said this is the second year in succession that RHS tomato trials have failed because of problems caused by peat-frees.

Sharples added that last year Wisley, Harlow Carr and Rosemoor trials failed: "The trouble is the RHS has the policy to use peat-free wherever possible." Tozer and Thompson & Morgan were also among those supplying tomatoes to the trial.

Steve Harper, managing director at green waste compost maker Vital Earth, which is not accused of supplying the compost, said: "All PAS100-certified composters have to go through a large number of hoops to ensure that their product is fit for purpose, including growth trials."

He suggested waiting for results from the Sustainable Growing Media Task Force, "which among other things is investigating which substrates are sustainable - peat will be judged fairly against all other substrates - and looking for methodology to ensure that all growing media sold in the retail and professional markets do what they are supposed to do."

Clopyralid pollution - Chemicals Regulation Directorate view

The Chemicals Regulation Directorate (CRD) said of clopyralid pollution: "We do not hold a specific register or record of these sorts of cases.

"We are aware of the potential problem but not of any specific evidence, other than perhaps anecdotal evidence, for example from information received from organisations such as the RHS."

WRAP has been looking into the potential for compost contamination as part of Defra's policy to reduce peat usage.

The CRD meets twice a year with the RHS and other groups where queries from consumers that could be attributable to herbicide contamination of compost have been mentioned.


Have you registered with us yet?

Register now to enjoy more articles and free email bulletins

Sign up now
Already registered?
Sign in

Before commenting please read our rules for commenting on articles.

If you see a comment you find offensive, you can flag it as inappropriate. In the top right-hand corner of an individual comment, you will see 'flag as inappropriate'. Clicking this prompts us to review the comment. For further information see our rules for commenting on articles.

comments powered by Disqus

Read These Next

Is a post-Brexit seasonal worker scheme now impossible?

Is a post-Brexit seasonal worker scheme now impossible?

The UK fresh-produce sector has reacted with dismay at the latest developments in the ongoing debate, largely conducted out of public view, on whether UK horticulture will still have access to seasonal migrant workers when the UK leaves the EU in 18 months' time.

Can UK fresh produce come out of Brexit ahead?

Can UK fresh produce come out of Brexit ahead?

UK production horticulture can become more profitable under one possible Brexit scenario, while other more drastic scenarios will lead to only minor losses in profitability, a new report argues.

Business Planning - Staff are your greatest asset

Business Planning - Staff are your greatest asset

An effective strategy to retain staff is the best way for any business to avoid a potential recruitment crisis, Neville Stein advises.


Follow us on:
  • Facebook
  • LinkedIn
  • Twitter
  • Google +
Horticulture Jobs
More Horticulture Jobs

Pest & Disease Tracker bulletin 

The latest pest and disease alerts, how to treat them, plus EAMU updates, sent direct to your inbox.

Sign up here

Professor Geoffrey Dixon

GreenGene International chair Geoff Dixon on the business of fresh produce production
 

Read Professor Geoffrey Dixon