Agronomic assessment of solar dried recycled olive mill sludge on Maize agrophysiological traits and soil fertility

Document Type : Original Article

Authors

1 Laboratory of Microbial Biotechnology, AgroSciences and Environment, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakesh 40000, Morocco

2 AgroBioSciences Program, Mohammed VI Polytechnic University (UM6P), Benguerir 43150, Morocco

Abstract

Purpose Olive mill waste sludge (OMWS) is a solid by-product resulting from olive oil extraction, OMWS is usually left decanting in landfills causing environmental pollution and a significant loss of recyclable organic resources. This study aims to evaluate the feasibility of producing an organic amendment through treating OMWS with solar drying (SDy), which is a low-cost method, highly adapted to semi-arid and low-income countries.
Method We investigated the effect of 90 days SDy on OMWS physico-chemical properties, then the agronomic efficiency of the resulting product was assessed under greenhouse conditions, using Zea mays as a crop model.
Results The SDy treatment significantly reduced OMWS initial moisture and the C/N ratio, while the nutrient content of the final product was improved. Pot trial under greenhouse conditions revealed that the application of SDy-OMWS improved the soil physico-chemical properties. The initial application decreased soil pH from 8.19 to 7.06, and soil phosphorus (P), potassium (K), iron (Fe) and zinc (Zn) increased by 209%, 162.4%, 290% and 270% respectively compared to the unamended control. SDy-OMWS application initially induced a delayed seed germination and plant growth at early stages, which was followed by a significant improvement of plant above and below ground traits, including photosynthetic activity, stomatal conductance, and root parameters (RL, RSA and RV).
Conclusion Overall, SDy significantly reduced the C/N ratio, moisture, and improved the nutrient content of OMWS. Despite improving soil fertility, SDy-OMWS application negatively affected the plant development at early stages. However, such effect was completely alleviated at the end of the experiment.

Highlights

  • Nitrogen-fixing bacteria biologically fixes atmospheric nitrogen in natural and cropped systems.
  • Organomineral fertilizers are improving crop performance, resistance and productivity.
  • Azospirillum brasilense and Bradyrhizobium japonicum enhanced soybean proline activity.
  • Soybean protection was improved when brasilense and B. japonicum were co-inoculated.
  • Organomineral fertilizer is an efficient inoculant carrier for brasilense in soybean plants.

Keywords


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