Microdosing of Compost for Sustainable Production of Improved Sorghum in Southern Mali
Moumini Guindo, Bouba Traoré, Birhanu Zemadim Birhanu, Alou Coulibaly, Ramadjita Tabo
Agronomy June 23, 2022 DOI: 10.3390/agronomy12061480 via DOAJ
Summary
AI-generated from the abstractApplying a microdose of compost at 2.5 t ha⁻¹ improved sorghum growth rate, plant height, grain yield, and biomass yield by 15%, 18%, 47%, and 27%, respectively, compared to a control receiving only DAP fertilizer. No statistical difference in yield (2061 kg ha⁻¹) was observed between microdosing at 2.5 t ha⁻¹ and broadcasting at 5 t ha⁻¹. Microdosing allowed a 100% increase in fertilized surface area and over 55% nitrogen use efficiency, yielding an economic gain of 334,800 XOF ha⁻¹—27% higher than broadcasting. However, broadcasting contributed more to soil nitrogen stock (100% vs. 12–20% for microdosing). Cotton stems offer an opportunity for farmers to adopt microdose technology to double fertilized area and boost sorghum productivity in southern Mali.
Study at a glance
| Characteristics | Field experiment on farmer fields Peer reviewed |
|---|---|
| Sample size | 30 |
| Population | Sorghum fields in the southern zone of Mali |
| Interventions | Cotton stem compost Farmer compost DAP |
| Dose | 2.5 t ha⁻¹ and 5 t ha⁻¹ for compost; 100 kg ha⁻¹ for DAP |
| Duration | 2019 and 2020 growing seasons |
| Keywords | Organic manure Broadcasting Yield Fertilizer Sahel |
| Key finding | Compost microdosing at 2.5 t ha⁻¹ matched the yield of broadcasting at 5 t ha⁻¹ while doubling the fertilized area and increasing economic returns by 27%. |
Abstract
The depletion of soil organic matter is one of the major challenges constraining agricultural production in the southern zone of Mali. This study evaluated the effects of compost types, methods, and dose applications on the productivity and sustainability of sorghum. Two types of compost (farmer practice and cotton stems) were applied to sorghum at two rates (microdosing at 2.5 t ha−1 and broadcasting at 5 t ha−1) and evaluated on 30 farmer fields in 2019 and 2020. The treatments used included CPA (cotton stem compost at 5 t ha−1 + 100 kg ha−1 DAP), CPA (cotton stem compost at 2.5 t ha−1 + 100 kg ha−1 DAP), CP (farmer compost at 5 t ha−1 + 100 kg ha−1 DAP), CP (famer compost at 2.5 t ha−1 + 100 kg ha−1 DAP), control (100 kg ha−1 DAP), and control. The results showed that regardless of the compost type, applying a microdose of 2.5 t ha−1 improved the growth rate, plant height, grain yield, and biomass yield by 15%, 18%, 47%, and 27%, respectively, when compared to the control. No statistical difference was observed in the yield of 2061 kg ha−1 between applying compost by microdosing at 2.5 t ha−1 and broadcasting at 5 t ha−1. It can be inferred that the application of compost by microdosing makes it possible to achieve a 100% fertilized surface compared to broadcasting, with a nitrogen use efficiency of more than 55%. The application of compost by microdosing at 2.5 t ha−1 resulted in an economic gain of 334,800 XOF ha−1, which was 27% higher than that obtained with the application of compost by broadcasting at 5 t ha−1. Conversely, the contribution to the improvement of soil nitrogen stock varied from 12–20% with a microdose of 2.5 t ha−1 compared to 100% for broadcasting compost at 5 t ha−1 per application. Therefore, the availability of cotton stems in the southern zone of Mali presents an opportunity for farmers to implement compost microdose technology to double the fertilized area and improve sorghum productivity.