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Value addition and risk assessment of dairy digestate as biofertilizer on crop yield and soil fertility

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Abstract

The agricultural applicability of biogas digestate from cattle manure is based upon its effects on soil fertility and the content of different elements in the grown crop. The aim of this study was to evaluate digestate characteristics obtained from cattle manure and its application on soil fertility and growth of crops (Sorghum bicolor (L.) Moench, Saccharum officinarum L., Gossypium hirsutum L., Zea mays L., Triticum aestivum L.) in field-scale experimentation. Samples of digestate, soil, and crops were collected and analyzed according to standard methods. Afterward, accumulation factor (AF), sodium absorption ratio (SAR), magnesium absorption ratio (MAR), and health index (HI) were determined. The results showed that macro and micronutrients (N, P, K, Fe, Zn, Cu, and Pb) in the digestate group were below the permissible limits and also have irrigational value (SAR > 10) as compared to the control group. Available P and K contents were high in digestate irrigated soil and crop as compared to the control group. The correlation analysis showed that digestate irrigated crops has a strong correlation with high R2 values (0.90) than control soil crops. Accumulation factor was found highest in G. hirsutum (1.48) in Fe. Health index value in adults was within the permissible limit (HI > 1) but the value in children was near to threshold level in T. aestivum. crop as compared to control. It may be concluded that the use of digestate will become a valuable additional source in the enhancement of soil fertility and crop growth.

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Acknowledgements

All authors greatly acknowledge the facilities provided by Government College University, Lahore for sample analysis in the laboratory.

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  1. Sustainable Development Study Center, Government College University, Lahore, Pakistan

    Sidra Mukhtar, Abdullah Yasar, Yusra Mahfooz, Rizwan Rasheed, Amtul Bari Tabinda, Muhammad Adnan Ashraf & Afifa Malik

  2. Department of Environmental Science, Comsats University Islamabad, Abbottabad Campus, Abbottabad, Pakistan

    Muhammad Nauman

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  1. Sidra Mukhtar
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Contributions

Sidra Mukhtar and Yusra Mahfooz: primary data collected and wrote manuscript; Abdullah Yasar and Amtul Bari Tabinda: supervised the whole study; Muhammad Adnan Ashraf, Muhammad Nauman, and Afifa Malik: helped in preparing graphs and data analysis; Rizwan Rasheed: helped in the revision of the manuscript.

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Correspondence to Sidra Mukhtar.

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Mukhtar, S., Yasar, A., Mahfooz, Y. et al. Value addition and risk assessment of dairy digestate as biofertilizer on crop yield and soil fertility. Arab J Geosci 15, 245 (2022). https://doi.org/10.1007/s12517-021-09354-8

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