Biochar field testing in the UK: Outcomes and implications for use

Jim Hammond*, Simon Shackley, Miranda Prendergast-Miller, Jason Cook, Sarah Buckingham, Valentini A. Pappa

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

38 Citations (Scopus)


Background: There is a lack of biochar field trials in temperate climate regions. Wood biochar was applied during 2009-2011 to seven field experiments on five working farms in the UK, for arable, legume, horticultural and root crops. Results: Three trials showed no significant (p > 0.05) effect on crop yield, two showed positive effects of 5-6%, one showed a very strong increase of 100% and one showed a decrease of 2-16%. A meta-analysis of effect sizes was conducted for all treatments (n = 47), which showed a significant (p < 0.05) positive effect, increasing average yield by 0.4 t ha-1. Biochar application rates of 20 t ha-1 or under led to the greater benefits. Conclusion: This paper shows that, in some situations, biochar can bring benefits in modern temperate farming.

Original languageEnglish
Pages (from-to)159-170
Number of pages12
JournalCarbon Management
Issue number2
Publication statusPublished - 1 Apr 2013
Externally publishedYes


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