Which method is suggested for maintaining soil temperature before a fumigation application?

Leaving the soil covered with a tarp for several sunny days is an effective method for maintaining soil temperature before a fumigation application. This technique utilizes the greenhouse effect, where the tarp allows solar radiation to penetrate and heat the soil while reducing heat loss through evaporation and air circulation. Keeping the soil warm is crucial because adequate temperature can enhance the efficacy of the fumigant, ensuring that it is more active in the soil and can effectively control pests.

The other methods may not achieve the same impact on soil temperature. For example, while watering the soil thoroughly is important for moisture content, it does not necessarily raise the temperature. Applying fertilizers could alter the soil chemistry but doesn’t significantly influence temperature, and turning the soil frequently would likely lead to heat loss rather than stabilizing or enhancing it. Thus, covering the soil with a tarp is the best choice to maintain optimal conditions for fumigation.