10 March 2026 Our Alparama® Terra Preta 30-litre bags are being filled – Terra Preta season has started! Today, there is plenty of activity on our farm. Markus, Röbi, and Jason – together with a few friends from the 6th grade – are currently filling our Alparama® Terra Preta nutrient humus into 30-litre bags. Our Terra Preta is produced on our farm in Schönengrund at over 1,000 metres above sea level using activated biochar, animal manure from our pigs, dairy cows, and alpacas, as well as a wide range of living microorganisms.