What is defined as practices that promote plant health to suppress weed growth without the use of chemicals?

Cultural control refers to a range of agronomic practices aimed at enhancing the overall health and vigor of plants, which in turn helps suppress weed growth naturally, without resorting to chemical herbicides. This approach includes practices such as crop rotation, proper plant selection, soil enrichment, and appropriate watering techniques, all of which strengthen the desired plants and create an environment less suitable for weeds.

By promoting dense, healthy vegetation, cultural control can effectively outcompete weeds for resources like light, water, and nutrients. Additionally, healthy plants are better able to resist pest pressures, further reducing the likelihood of weed establishment.

The other options, while also valid forms of weed management, do not fit the definition given in the question. Mechanical control involves physical interventions, such as mowing or tilling, while chemical control focuses on the use of herbicides. Biological control utilizes natural predators or parasites to manage weeds, but it involves different mechanisms than those emphasized in cultural practices.