Effects of topical silicon as a large‐mammal herbivory deterrent in a small‐scale restoration study

Introduction Herbivory by wild animals poses a significant challenge for revegetation projects in the arid southwest. Typical caging and fencing methods can reduce herbivory in small‐scale restoration projects but are often costly and can sometimes impair plant functioning. Reactive silicon (Si) may prove a promising alternative, as it is frequently induced in plants as a chemical defense against herbivory and is well associated with improved plant and soil health. Objectives This study examines the effects of Si supplementation on plant growth in a greenhouse setting and as an herbivory deterrent in a small‐scale restoration field study. Methods We measured plant height, cover, and biomass of plants supplemented and not supplemented with Si before and after exposure to herbivory. Results We found that Si supplementation did not reduce herbivory by field herbivores. However, before exposure to herbivory, plants supplemented with Si were significantly taller and wider than plants not supplemented with Si. Conclusion Si application can aid in increasing plant growth in a greenhouse setting prior to revegetation efforts, potentially improving establishment rates due to more vigorous and robust outplanted individuals.