Conventional farming practices, such as monoculture, conventional tillage, heavy chemical reliance and leaving soil bare is unsustainable. This is due to nutrient and diversity losses (both above and below the soil) and soil degradation. Globally 75% of arable soil is degraded due to conventional tillage.
Making the switch to more sustainable practices, such as conservation agriculture, is not easy as it dominates SA's commercial agriculture production and information is limited. Farmers who have done so successfully, urge other farmers to convert a small portion of their land first.
This page provides key resources for various sustainable practices.