Kohlrabi greenhouse trial shows nutrients recovered from human excreta can replace mineral fertilizer

A new study by Caroline Ganglo and Stefan Karlowsky from the Leibniz Institute for Horticultural Sciences (IGZ) investigated whether human excreta-derived fertilizers are suitable for replacing mineral fertilizer in kohlrabi production and how they affect plant N uptake and soil N fluxes. The results from the Horizon Europe Innovation Action "P2GreeN" show that a transition to circular nutrient flows and resilient local food production is possible without compromising food security. The study, titled "Application of nitrified urine fertilizer and fecal compost for growing kohlrabi in a controlled greenhouse environment," was published in Frontiers in Environmental Science.