Development of Compost from Agro-food Residues: Analysis of the Crop Nutrients and Trace Elements
A composting study of agro-food residues was conducted to evaluate the nutrient content of plants. Three types of composts were made: compost C1 based on organic matter; compost C2 based on organic matter and Tahoua rock phosphate and compost C3 based on organic matter, cow manure and Tahoua rock phosphate. During composting, the pH reached 9.60; 8.93 and 8.88 respectively for composts C1, C2 and C3 before falling respectively to 9.15; 7.90 and 7.83 at the end of composting. The temperature reached 57 ° C for all composts during composting before stabilizing at 31 ° C after composting. The analysis of the physicochemical parameters of the composts obtained reveals that they contain carbon contents (23.01%, 14.625% and 16.575% for C1, C2 and C3 respectively) and nitrogen (2.63%; 34% and 1.62% for C1, C2 and C3 respectively) and C / N ratios (8.74, 10.91 and 10.83 for C1, C2 and C3 respectively) and nutrients: available phosphorus (186.2, 399.70, 695.8 mg / kg for C1, C2 and C3 respectively), potassium (3389.97, 1127; 1313.30 for C1, C2 and C3 respectively), calcium (12000, 42800, 64000 mg / kg for C1, C2 and C3 respectively) and magnesium (18936.77, 15946.62, 16346.47 mg / kg for C1, C2 and C3 respectively).
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