Table 3 Results of the yield and proximate analysis of the biochars.

300 °C

eggplant

32.8^d

30.01^d

4.26^c

51.01^a

20.31^e

Acacia nilotica bark

51.3^e

40.03f.

2.67^ab

57.9^c

0.93^a

600 °C

eggplant

23.9^b

12.03^b

4.39^c

61.71^d

27.24f.

Acacia nilotica bark

34^d

5.84^a

1.81^a

92.01f.

2.29^b