Fig. 4From: Soil factors that contribute to the abundance and structure of the diazotrophic community and soybean growth, yield, and quality under biochar amendmentChanges in plant height, stem thickness, leaf area index, and biomass of different organs under different biochar treatments in 2020 and 2021 at key soybean fertility stages. B27, 45 t hm−2 biochar addition; B18, 30 t hm−2 biochar addition; B9, 15 t hm−2 biochar addition, B0, no biochar additionBack to article page