Journal of Food, Agriculture and Environment

Petrochemical sewage sludge effects on organic carbon and some physical quality indicators of a semiarid soil

Author(s):

Shokrollah Asghari

Recieved Date: 2010-07-18, Accepted Date: 2010-10-29

Abstract:

Petrochemical sludge is a cheap organic additive that can be used for modifying soil quality of semiarid regions in Iran. This study was conducted in large pots (50 cm diameter, 25 cm heigh) to characterize the organic carbon (OC), bulk density (ρ_b), particle density (ρ_p), total porosity (n), macroporosity (pores>30 µm), and available water capacity (AWC) of a calcareous semiarid soil in relation to the application of petrochemical sludge at four rates (25, 50, 75, and 100 Mg ha^-1) during time. There was also a control treatment (without sludge). Incubation of treatments was done in a greenhouse with field capacity moisture content of 0.7-0.8 and temperature of 22±4°C for 6 months. All parameters were measured at 60, 120 and 180 days. Results indicated that all used sludge rates significantly (P=0.01) increased OC and decreased ρ_b as compared to the control. Correlation between OC and ρ_b was significant (P=0.001). Macroporosity and AWC significantly (P=0.01) increased with sludge application only at the rate of 100 Mg ha^-1. Significant correlation was found between OC with ρ_b and AWC in the 3 incubation times. This study showed that the petrochemical sludge improved physical quality of the semiarid soil.

Keywords:

Semiarid soil, organic carbon, physical quality indicators, sewage sludge

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Journal: Journal of Food, Agriculture and Environment
Year: 2010
Volume: 8
Issue: 3&4
Category: Environment
Pages: 1053-1056

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