Long-term crop rotation and tillage

Why it matters (80-100 words)

South Africa’s dryland farming systems face increasing pressure from climate variability, soil degradation, and declining yields. While practices like crop rotation, reduced tillage, and cover cropping offer sustainable solutions, their long-term benefits are under-researched, especially in marginal areas. Most studies run only 3–5 years, too short to capture meaningful trends in soil health or productivity. This project addresses that gap through long-term trials in Bloemfontein and Kroonstad. The findings will inform more resilient, cost-effective farming systems that build soil health, improve yield stability, and increase farmer profitability in the face of climate stress.

Research approach (100 words)

Two long-term field trials were established in Bloemfontein and Kroonstad to evaluate different tillage and crop rotation systems under dryland conditions. The experiments use a randomised complete block design with 72 plots each and compare conventional tillage versus no-till systems. Three crop sequences, including monoculture, diverse rotations, and rotations with cover crops, are evaluated for their effects on soil moisture, yield, nematode diversity, and economic performance. Data collected includes soil biology, plant health, weather, and weed dynamics. The trials are designed to span multiple years, enabling robust evaluation of management practices and their implications for climate adaptation and sustainability.

Research impact to farmers (100 words)

By assessing the long-term benefits and trade-offs of tillage, crop rotation, and cover cropping, this research will help farmers make informed, profitable decisions. The trials offer region-specific data for dryland systems, where producers often face unpredictable weather and limited soil moisture. Insights from the study will support better risk management, more efficient input use, and higher resilience to drought. Economic evaluations will help guide practice adoption based not just on yield, but also return on investment. With pressure growing to farm sustainably while maintaining profits, this work equips farmers with science-backed strategies tailored to local realities.