Barley field near Wallington, Hertfordshire. Copyright: Paul Dixon. Licensed for reuse under a Creative Commons Licence.
Biochar increases crop productivity in many tropical soils. The reasons probably include improved water retention, reduced leaching, and better availability of nutrients to plant roots. In temperate conditions, studies have been fewer in number and haven’t produced results that are as clear. A new study[1] adds usefully to our knowledge.
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