Swiss biochar

http://www.swiss-biochar.com/eng/biochar.php

The biochar is produced from urban lop, grape pomace, wood, miscanthus and other suitable biomasse. The biochar production is guaranteed climate-positive and free from eco-toxicological substances. The high quality biomasses are pyrolysed at 400 to 450°C to come up with particularly effective microporosity of the biochar. It is recommended to activate the biochar with ripe compost at a volume ratio of 1:1 until 1:2.  We recommend the application of 10 tonnes of biochar per hectare or 1 kilogram per square meter.