How do shelterbelts benefit agriculture aside from reducing wind?

Shelterbelts, or windbreaks, are rows of trees or shrubs planted to protect agricultural land from wind. One of the key benefits of shelterbelts is their ability to trap snow. When snow accumulates in the shelterbelt areas, it enriches the soil moisture when it melts, providing much-needed water for crops during the growing season. This increased moisture can enhance soil conditions and lead to higher crop yields.

In contrast, other options provide benefits that are not typically associated with shelterbelts. For example, increasing soil acidity can hinder crop growth and is generally not a desired outcome. Decreasing plant diversity would counteract the ecological benefits of a hedge by creating habitats for various species. Lastly, while shelterbelts can improve moisture retention, they do not eliminate the need for irrigation entirely, as this depends on various factors like soil type, crop type, and climate conditions. Therefore, the primary benefit of shelterbelts in trapping snow and consequently boosting crop yields makes this option the correct choice.