10.1007/s40093-017-0176-4

The effect of municipal sewage sludge on the quality of soil and crops

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  • Suad Jaffar Abdul Khaliq1,
  • Ahmed Al-Busaidi1,
  • Mushtaque Ahmed1,
  • Malik Al-Wardy1,
  • Hesham Agrama1,
  • B. S. Choudri*1,
  1. Sultan Qaboos University

Received: 2017-02-21

Accepted: 2017-09-13

Published in Issue 2017-09-19

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

How to Cite

Jaffar Abdul Khaliq, S., Al-Busaidi, A., Ahmed, M., Al-Wardy, M., Agrama, H., & S. Choudri, B. (2017). The effect of municipal sewage sludge on the quality of soil and crops. International Journal of Recycling of Organic Waste in Agriculture, 6(4). https://doi.org/10.1007/s40093-017-0176-4
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Abstract

Purpose

To examine the effects of the application of composted sewage sludge fertilizer (commercially sold as Kala compost) and inorganic (NPK) fertilizers on soil quality and on two crops (radish and beans) irrigated using groundwater and sewage treated wastewater (TWW) for irrigation by measuring heavy metals in the soil and plants and other parameters such as crops yield, TOC in soil, chlorophyll index and total nitrogen.

Methods

The field experiments were conducted in an open area in Agricultural Experimental Study at Sultan Qaboos University campus, Oman. In this research, “green beans and white radish” were examined under the application of Kala and NPK fertilizers. The experimental design was a randomized complete block with four replicates.

Results

The results showed that the yield, TOC and chlorophyll contents of green beans and white radish increased when soil was amended with Kala compost compared to NPK. Chemical analysis of soil and the two crops did not show any risk of heavy metal accumulation.

Conclusions

Considering that the experiment was a short duration one, there is a need for more continuous long-term experiments (at least 5 years) that will improve the understanding on the effects of composted sewage sludge on soil fertility and crop yield to contribute to the development of sustainable agricultural practices in an arid environment of Oman.

Keywords

  • Green beans,
  • Kala compost,
  • Oman,
  • Sewage sludge,
  • Soil quality,
  • White radish
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