DOI: 10.36347/sjavs.2020.v07i03.003

Pages: 65-72

Depletion of soils and climate change are currently reducing crop yields in West Africa. As a solution, soil improvement based on organic waste products is often considered. The experimental device used for this experiment is a File block with three repetitions which includes five treatments, namely T0: control plot, T1: treatment of bio-waste after one month of degradation, T2: treatment of bio-waste after three months of degradation, T3: NPK treatment drawn 15-15-15 (fertilizer for cotton), frequently used by populations in the fertilization of vegetable crops and T4: biofertilizer from the local market. The lettuce seedlings of the verdana variety (Lactuca sativa) from a nursery, were sown on the different treatments, then followed for 45 days. Biowaste samples at one month and three months of degradation, as well as soil samples taken in a depth of 0 to 20 cm, after the experiment were used for various laboratory analyzes. The results obtained indicate that the T2 treatment had a better carbon level (C = 2.04 g / kg) compared to the other treatments. Furthermore, the study revealed C / N ratios varying between 6.05 and 9.13 for treatments based on bio-waste compared to the control (C / N = 2). The lettuce yields obtained after the various applications of bio-waste have significantly improved compared to other treatments (control, biofertilizer and chemical fertilizer). Thus for T0 the yield obtained is 0.23T / ha against 1.39T / ha for T1, 0.57 T / ha for T2; 0.4 T / ha for T3 and 0.23 T / ha for T4. Compared to the technical data sheet for this variety of lettuce, the T1 treatment has a better yield compared to others.