Municipal Solid Waste Compost Improves Crop Productivity in Saline-Sodic Soil: A Multivariate Analysis of Soil Chemical Properties and Yield Response

ABSTRACT

A pot experiment was conducted in sandy clay loam saline-sodic soil to assess the effects of farm yard manure (FYM), municipal solid waste (MSW) composts and gypsum application on nitrate leaching, soil chemical properties and crop productivity under rice-wheat cropping system. It also aims at establishing the correlation between soil phsico-chemical properties and yield response using principle component analysis and Pearson correlation analysis. The MSW was decomposed aerobically, an-aerobically and co-composted. Maximum nitrate leaching was observed during rice (75.9 mg L⁻¹) and wheat (37.2 mg L⁻¹) with an-aerobically decomposed MSW as compared with control treatment. Results revealed a decrease in soil pH (−6.95% and −8.77%), electrical conductivity (EC) (−48.13% and −51.04%), calcium carbonate (CaCO₃) (−40.30% and −48.96%), and sodium adsorption ratio (SAR) (−40.27% and −45.98%) with an-aerobically decomposed MSW compost during rice and wheat, respectively. In this treatment, organic matter (OM) (93.55% and 121.51%) and cation exchange capacity (CEC) (19.31% and 31.79%) were the highest as compared with control treatment during rice and wheat, respectively. Rice and wheat growth were significantly (p≤ 0.05) increased by an-aerobically decomposed MSW followed by co-compost, aerobically decomposed MSW, FYM, gypsum and control. Furthermore, Pearson correlation coefficients predicted significant positive correlation of yield with soil OM, and CEC while inverse relationship was observed with EC, pH, CaCO₃, and nitrogen use efficiency. Soil amelioration with organic and gypsum amendments was further confirmed with principal component analysis. This study has proved an-aerobically decomposed MSW as an effective solution for MSW disposal, thereby improving soil chemical properties and crop productivity from sandy clay loam saline-sodic soil.

KEYWORDS:

• Municipal solid waste
• saline-sodic soil
• reclamation
• crop productivity
• an-aerobic decomposition
• principle component analysis

Acknowledgments

We are thankful to the Office of Research, Innovation and Commercialization (ORIC) COMSATS University Islamabad, Pakistan for providing funds under COMSATS Research Grant Program having Reference No. 16-73/CRGP/CIIT/IBD/15/738 to conduct this experiment. We gratefully acknowledge the helpful comments from anonymous reviewers who made excellent suggestions that helped to improve this manuscript.

Supplementary material

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Additional information

Funding

This work was supported by the COMSATS University Islamabad [16-73/CRGP/CIIT/IBD/15/738].