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Table 5 Residual effects of biochar farmyard, compost and/or NPK applications on the exchangeable bases (K+, Mg2+ Ca2+ Na+)

From: Residual effects of corncob biochar on tropical degraded soil in central Uganda

Treatment

Potassium (cmol/kg)

Calcium (cmol/kg)

Sodium (cmol/kg)

Magnesium (cmol/kg)

CTRL

0.16c

1.57e

0.20cd

0.45e

CM

0.28bc

1.99cd

0.24c

0.56cd

NPK

0.36ab

1.67de

0.36a

0.51de

BC1

0.34ab

1.80de

0.21cd

0.59bc

BC2

0.39ab

2.51b

0.16d

0.65b

BC1 + CM

0.38ab

2.47b

0.20bc

0.67ab

BC2 + CM

0.43a

3.38a

0.26cd

0.74a

BC1 + NPK

0.44a

2.28bc

0.32ab

0.55cd

BC2 + NPK

0.46a

2.48b

0.38a

0.65b

SignificantX

***

***

***

***

SEDY

0.03

0.06

0.01

0.01

  1. SignificantX effects were obtained from one-way analysis of variance: *, **, ***Significant at P < 0.05, P < 0.01, and P < 0.001, respectively. See Table 2 for a description of the treatments; Means followed by the same letter in each column are not significantly different at p ≤ 0.05 using Tukey HSD