Fig. 1From: Soil factors that contribute to the abundance and structure of the diazotrophic community and soybean growth, yield, and quality under biochar amendmentNumber of nifH gene copy for biochar-amended soils. B27, 45 t hm-2 biochar addition; B18, 30 t hm-2 biochar addition; B9, 15 t hm-2 biochar addition, B0, no biochar addition. Different lowercase letters indicate significant (p < .05) differences among treatmentsBack to article page