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The sustainable improvement of plant nutrition can provide sufficient food for all and can keep the environment clean. In that point of view, the present study aims to provide to farmers some contextualized and efficient fertilizers. In the present work, 161 plants of Talinum fruticosum L. and 161 plants of Ocimum gratissimum L. were regularly treated with a mixture of human urine and water from cooked beans (Phaseolus vulgaris) in a 1:1 ratio during three months. 161 of each of these plants were used as control. The experimental design was a randomized complete block in 4 replicates. The size of the studied parts of the targeted plants was highly enhanced in three months in response to the use of the mixture. The leaves of Ocimum gratissimum L. treated shew an average of 22 cm of length and 7.7 cm of width while those of the control shew an average length of 8 cm and 4.8 cm of width. Concerning the leaves of Talinum fruticosum L. treated, they measured 10.1 cm of length and 4 cm of width in average and those of the control 4.1 cm of length and 2 cm of width in average. Peasants could thus save a lot of money by using their excreta and some of their sewages as fertilizers to promote the sustainable development of their ecosystems. Further lab analysis on water from cooked beans alone and on the mixture made of human urine and water from cooked beans could ease in the future the acquirement of new knowledge about them. The consequence of that improvement will simply be the capitalization of those fluids as source of easily absorbable nutrients for plants nutrition.
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