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 |
- 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)