Why It Matters
Understanding soil health is essential for sustainable agriculture, especially in South Africa’s diverse grain production regions. This project investigates how soil ecosystems change over time under different farming systems and environmental conditions. By integrating biological indicators like nematodes and microbial activity, the study provides deeper insights into nutrient cycling, disease suppression, and soil resilience. These findings help reduce reliance on agrochemicals and improve long-term productivity. The research supports informed decision-making and promotes ecological sustainability, benefiting both commercial and emerging farmers.
Research Approach
The project uses a longitudinal design to monitor soil health across summer and winter grain production systems in South Africa. Soil samples are collected at multiple intervals throughout the growing season from trial sites in Kroonstad and Langgewens. Key indicators include nematode community structure, microbial and enzymatic activity, nutrient availability, and abiotic soil properties. Advanced techniques such as Oxford Nanopore sequencing are being introduced to enhance biological community analysis. Statistical modelling is used to identify optimal monitoring frequencies and ecological patterns, with collaboration from local and international institutions.
Research Impact to Farmers
Farmers gain access to science-based insights into soil health dynamics, enabling better crop management and reduced input costs. The project’s findings help identify optimal times for soil monitoring, improving the accuracy of assessments and guiding sustainable practices. By linking soil biodiversity to ecosystem services, the research supports strategies that enhance soil fertility, water retention, and resilience to drought. Ultimately, this empowers farmers to adopt more efficient and environmentally friendly farming systems, boosting productivity and long-term sustainability in grain production.
Resources
Articles:
- Du Preez et al. (2024). Time Matters: A Short-Term Longitudinal Analysis of Conservation Agriculture and Its Impact on Soil Health. Journal of Soil Science and Plant Nutrition.
- Du Preez et al. (2022). Nematode-based indices in soil ecology. Soil Biology and Biochemistry.
Collaborators & Research Leads
Lead Researcher:
- Prof Gerhard du Preez (North-West University)
Collaborative Institutions:
- North-West University
- University of the Free State
- Elsenburg Agricultural Training Institute
- Michigan State University