Summary
This two-year field study tested agronomic adaptations to climate variability in Ethiopian rainfed agriculture on smallholder farms. Researchers evaluated crop rotation patterns and six organic fertiliser types (plus chemical and no-fertiliser controls) for their effects on soil moisture retention using teff and wheat as test crops. Poultry manure produced the highest overall soil moisture content (29.2 m³ m⁻³), whilst legume-cereal rotation, particularly maize following soybean (33.1 m³ m⁻³), outperformed other rotation sequences, suggesting both practices warrant adoption as climate adaptation strategies.
Regional applicability
The study was conducted in Ethiopia and addresses challenges specific to sub-Saharan African smallholder rainfed agriculture where irrigation is unavailable or unaffordable. Findings may have limited direct applicability to United Kingdom farming systems, which typically benefit from more reliable rainfall, established irrigation infrastructure, and different crop-livestock combinations; however, the principles of using organic matter and legume integration to improve soil water-holding capacity are relevant to UK climate adaptation and soil health strategies under future drier conditions.
Key measures
Volumetric soil water content (m³ m⁻³) measured every two days using Delta-T wet sensor; cereal-cereal, cereal-legume, legume-cereal, and legume-legume crop rotations; cattle manure, poultry manure, conventional compost, vermicompost, green manure, and crop residue application rates
Outcomes reported
The study measured volumetric soil water content under different crop rotation sequences and organic fertilizer treatments in rainfed conditions. Results demonstrated that both crop rotation and nutrient management significantly affected soil moisture retention, with poultry manure and legume-cereal rotations showing the greatest water conservation.
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