Straw has been shown to reduce evaporation and increase the soil moisture available for plant use.
Straw was found to significantly reduce evaporation during the rainless period and increase the infiltration and movement of excess soil moisture below 54 in.
Straw
Straw mulch helps retain soil moisture, reduce evaporation, and protect plants during hot and dry weather. Many gardeners use straw per bale to cover garden beds, improve soil conditions, and reduce weed growth naturally.
Straw acts as a protective layer over the soil, slowing evaporation and helping the ground hold moisture longer. It also improves water infiltration after rain, allowing moisture to move deeper into the soil for healthier plant growth.
One bale of straw typically covers around 200 to 500 square feet depending on the thickness applied. Coverage may vary based on whether the straw is used for gardening, landscaping, erosion control, or moisture retention.