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Table 3 Copy numbers of ammonia-oxidizing bacteria (AOB) in the rhizosphere of very fine (d < 0.1 mm) and fine (0.1 < d < 2 mm) roots of Gossypium hirsutum in the different treatments

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

Treatment

Very fine root

Fine root

ck

4.71 × 107

5.21 × 107

s

8.65 × 107

4.98 × 107

b

6.86 × 107

4.53 × 107

soa

7.29 × 107

9.70 × 107

sob

6.58 × 107

9.28 × 107

boa

5.44 × 107

1.08 × 108

bob

7.83 × 107

6.95 × 107

  1. The treatments are as follows: ck (control), sb (conventional 3.76 g urea kg−1 soil applied in the 0–10 cm soil layer), bb (conventional nitrogen fertilization 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 with 37.28 g biochar kg−1 soil)