What technique often results in poor farmland?

Slash-and-burn agriculture is a farming technique often used to clear land for agriculture in places where there are dense forests. This technique often used in the tropics, involves cutting down trees and vegetation and then burning them. This burning helps clear the land and return nutrients to the soil, but it can result in poor farmland. Over time, this practice depletes the soil of nutrients, leading to low crop yields and poor soil fertility.