Biochar from On-Farm Feedstocks for Sustainable Potassium Management in Soils

Potassium is an essential soil macronutrient for crop production, yet a large proportion of potassium is either lost or accumulates in plant tissues. Therefore, recycling potassium accumulated in plant tissues and reducing potassium losses from the soil is a major challenge for the agricultural system. In this context, the development of biochar from on-farm feedstocks and plant tissues appears as a sustainable solution for ensuring environmental and agricultural sustainability. In this review, we show that that potassium accumulated in on-farm feedstocks can be retained and converted into stable potassium in biochar. Potassium-enriched biochar is sustainable potassium source that reduces potassium loss.