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Fig. 1 | BMC Plant Biology

Fig. 1

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

Fig. 1

Activities of the key enzymes involved in nitrogen metabolism in the fine and very fine roots of Gossypium hirsutum in the different treatments. GDH = Glutamic dehydrogenase, GPT = Glutamic-pyruvic transaminase, GOGAT = Glutamic synthase, and NR = Nitrate Reductase. 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 root and fine root, respectively. Results are presented as mean values for five plants with SE. Asterisk indicates significant difference with a confidence interval at *P < 0.05 or **P < 0.01

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