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Fig. 4 | BMC Plant Biology

Fig. 4

From: Biochar and biofertilizer reduced nitrogen input and increased soybean yield in the maize soybean relay strip intercropping system

Fig. 4

Soybean nodule number and nodule weight under different organic material and nitrogen levels. Note: Fig. A and B represent soybean nodule numbers in 2019 and 2020, respectively. Fig. C and D represent soybean nodule weight in 2019 and 2020, respectively. The growth stage, nitrogen treatment, fertilizer treatment, and significant signs are described in Fig. 2

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