Optimization of the Johnson-su bioreactor method for the production of organic fertilizer by composting cassava waste at Ngotto, East Cameroon Region.
Contextualizing a nature-based technological approach
DOI:
https://doi.org/10.48346/IMIST.PRSM/ajlp-gs.v7i6.51941Keywords:
sustainable agriculture, composting, Johnson-Su method, Organic matterAbstract
Context and background:
High population growth and standardized consumption patterns are driving demand for food products. Unfortunately, climate change is putting a strain on production systems. As a result, producers are increasingly resorting to chemical inputs to boost productivity. However, the financial costs as well as the socio-environmental and health consequences of these products are not likely to encourage their use, as in the long term they contribute to the precariousness of land and ecosystems. Moreover, waste is a real threat to people and municipalities.
Goal and objectives:
The aim of this study was to formulate a compost based on cassava peelings combined with cow dung and Tithonia diversifolia using the Johnson-Su composting technique.
Methodology:
Two types of compost have been developed from cassava peelings. These were M composts (33.33% cassava peelings + 33.33% cow dung + 33.33% Tithonia diversifolia) and E composts (100% cassava peelings). Three piles of each type of compost were built during the 90-day trial.
Results:
The physico-chemical results obtained show a significant difference between the 2 treatments in parameters such as temperature (F=7.908, P<0.05) and humidity (F=21.603, P<0.05) over the course of the trial. The highest temperature was recorded by treatment M (59.25 °C), a neutralization of pH at the end of the composting process and an increase in fungal microflora and MBC and a decrease in bacterial population and compost volume throughout the composting process. Germination rates on lettuce and tomato crops were all above 50% for both treatments. The sum of fertilizing elements (N + P2O5 + K2O) in compost M (0.444%) and compost E (0.463%) was less than 7%, in compliance with standard NFU44051. These results show that the composts obtained meet the characteristics of a product with good agronomic value, stable, hygienic and suitable for sustainable agriculture.
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