Agronomic valorization of digestates from anaerobic digestion from cow dung in the Faranah Administrative Region (Republic of Guinea)

physics

In order to promote local natural resources in maize fertilization and to minimize the negative impact of high doses of chemical fertilizers on farms in the Faranah administrative region, a fertilization test on the effect of digestates from cattle dung on maize was carried out in the experimental station of the Higher Agronomic and Veterinary Institute of Faranah, from June 18 to October 11, 2018. The site of study has a slightly acid ferralitic soil of 6.25, poor in nutrients with 1.99% organic matter. The analyzes revealed that the digestate of the methanization and the dung of Faranah dung have the highest dry matter and ammonia contents and those of Dinguiraye have the lowest. As for the pH, it is slightly acidic for Faranah and strongly acidic for Dinguiraye. The variation in the crude fiber content is higher between digestates and lower between minerals. Moisture, dry matter, fat and protein show intermediate fluctuations between them. The experimental device used is the Randomized Full Block with 4 repetitions. The plant material used is the "hope" corn variety from Burkina Fasso. The treatments studied are: absolute control (To), Digestat Faranah (DFa), Dabola (DDa) and Dinguiraye (DDi) all made at a rate of 12.5 t/ha. Statistical analyzes made with the Genstat 12 software, showed that the studied parameters (average growth rate, average height of the plants at harvest and weight of 1000 grains) showed a non-significant difference between the digests; the average number of rows per ear and yield showed a significant difference between digests while the average ear length and the average number of seeds per row showed a highly significant difference between treatments. In terms of yield, Dabola (4.67 t/ha) and Faranah (3.39 t/ha) digests gave the best with no significant difference between them and that of the lowest yielding control (1.62 /ha).

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