Table 6
Soil organic carbon (%) as influenced by organic waste application (average ± standard deviation)
Treatments	First crop (wheat)	Second crop (guar)	Third crop (wheat)
0 to 20 cm
C	0.45e ± 0.01	0.43e ± 0.01	0.23f ± 0.01
CR	0.45e ± 0. 01	0.79d ± 0.01	1.25c ± 0.06
H	1.19b ± 0.01	1.24b ± 0.01	0.92d ± 0.10
SS	1.88a ± 0.01	1.92a ± 0.01	1.85a ± 0.06
RF	0.50c ± 0.02	0.41f ± 0.01	0.39e ± 0.01
RF + CR	0.50c ± 0.01	1.23c ± 0.01	1.72b ± 0.10
LSD	0.017	0.015	0.093
P≤	0.0001	0.0001	0.0001
Treatments	First crop (wheat)	Second crop (guar)	Third crop (wheat)
20 to 40 cm
C	0.46c ± 0.01	0.36e ± 0.01	0.19e ± 0.01
CR	0.46c ± 0.01	0.62d ± 0.01	1.10b ± 0.08
H	0.63b ± 0.01	0.80c ± 0.01	0.65c ± 0.06
SS	0.88a ± 0.01	0.98b ± 0.01	1.42a ± 0.10
RF	0.47c ± 0.01	0.39e ± 0.01	0.30d ± 0.01
RF + CR	0.47c ± 0.01	1.04a ± 0.05	1.35a ± 0.06
LSD	0.012	0.042	0.093
P≤	0.0001	0.0001	0.0001

Means in columns, within each depth, followed by different letters are significantly different at P ≤ 0.05 using LSD.

Rezig et al. International Journal Of Recycling of Organic Waste in Agriculture 2012 1:1   doi:10.1186/2251-7715-1-1