4 per Mille 4 per mille Carbon sequestration rate Farmyard manure Fertilizers Forestry Hot water Hot-water extractable carbon Hungary Labile organic carbon Land use Long-term field experiment Long-term field experiments Magnesium Manures Matthiola Mineral fertilizers Minerals Organic carbon Plant residues Soils Total Organic Carbon Water carbon carbon sequestration crop yield grassland long-term change manure nitrogen