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Fig. 4 | BMC Plant Biology

Fig. 4

From: Biochar induced improvement in root system architecture enhances nutrient assimilation by cotton plant seedlings

Fig. 4

Active absorption areas and fresh weights of very fine and fine roots and seedling nitrogen agricultural efficiencies of Gossypium hirsutum in the different treatments. Fine roots are those with diameter between 0.1 and 2 mm, while very fine roots are those with diameter less than 0.1 mm. The treatments include ck (control), sb (conventional 3.76 g urea kg−1 soil applied in the 0-10 cm soil layer), bb (conventional 3.76 g urea kg−1 soil applied in the 10-20 cm soil layer), soa (urea was reduced by 25% on the basis of sb plus 37.28 g biochar kg−1 soil), sob (urea was reduced by 50% on the basis of sb plus 37.28 g biochar kg−1 soil), boa (urea was reduced by 25% on the basis of bb plus 37.28 g biochar kg−1 soil), and bob (urea was reduced by 50% on the basis of bb plus 37.28 g biochar kg−1 soil). The last letters “f” and “m” of each treatment indicate very fine roots and fine roots, respectively. Results are presented as mean values for five plants with SE. Asterisks indicate significant differences with a confidence interval at *P < 0.05 or **P < 0.01

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