What are pre-emergent herbicides used for in cotton farming?

Pre-emergent herbicides are specifically designed to control weeds before they have a chance to emerge from the soil. When applied properly before the planting or germination of cotton seeds, these herbicides create a chemical barrier in the soil that inhibits the germination and growth of weed seeds, thereby reducing competition for nutrients, water, and sunlight. This is particularly important in cotton farming, as it helps ensure that the crop has the best possible start by minimizing weed pressure from the outset.

The other options do not accurately reflect the purpose of pre-emergent herbicides; promoting seed germination pertains to the growth of cotton itself, enhancing soil fertility involves improving nutrient content rather than preventing weeds, and protecting crops from pests is about managing threats after the crops have emerged, rather than focusing on weed control prior to emergence.