Fig. 3

Soybean nitrogen accumulation and distribution at the R8 stage under different organic material and nitrogen levels in 2020. Note Fig. A, B, and C represent the soybean aboveground dry weight at the R2, R5, and R8 stages. Fig. D represents the N distribution in soybean organs at the R8 stage. The growth stage, nitrogen treatment, fertilizer treatment, and significant signs are described in Fig. 2