Wetting Agents 101: What They Are and How to Use Them

The utilization of wetting agents for turf management has been a staple practice for years. However, there's still a great deal to uncover about these chemistries, their mechanisms, and their performance under various field conditions. This knowledge is particularly vital for superintendents aiming to choose the most effective products for their courses.

In a recent presentation by Dr. Lehn Weaver, a renowned soil science expert, the science and benefits of wetting agents in turf management are explored in depth. Through our YouTube channel, Dr. Weaver discusses the fascinating mechanisms through which these substances enhance turf growth and performance.

What are Wetting Agents?

Wetting agents are essentially surfactants, a type of molecules with a hydrophilic (water-loving) and a hydrophobic (water-repelling) end. This dual nature enables these agents to interact with water and soil particles, facilitating water infiltration and distribution in soil.

Classifying Wetting Agents

Wetting agents can be categorized based on their impact on water movement:

• Vertical wetters (penetrants): Push water down into the soil.
• Horizontal wetters (spreaders): Spread water across the soil surface.
• Multi-functional wetters: Combine the benefits of both vertical and horizontal wetters.

Field Testing of Wetting Agents

A 2021 study at the University of Arkansas evaluated various wetting agents under field conditions. Multi-functional wetting agents emerged as the most effective, even at lower application rates, compared to vertical wetters. This suggests that lab findings are indeed translating to practical benefits in the field.

Selecting and Applying Wetting Agents

It's important for superintendents to select and apply wetting agents like a prescription, choosing the right agent with the correct function and strength for the job. With around 200 different products available in the market, understanding how they work is crucial to making informed decisions. Factors such as the cost, functionality, active ingredient concentration, and the agent's performance in the soil and on the turf need to be considered.

Effects on Different Types of Grass

While the wetting agents themselves might not behave differently on various grass types, the type of grass can influence their effectiveness. Differences in organic matter production, root exudates, root depths, and other factors can affect soil water repellency and the overall efficacy of a wetting agent.

Influence of pH Levels

Most wetting agents remain effective across varying pH levels, as they are typically uncharged. Therefore, they behave similarly regardless of the soil or water pH used for irrigation or spraying.

Unraveling Marketing Claims

One area of contention in the wetting agent market is the marketing claims made by some manufacturers. Some products claim they can remove the organic coating that causes hydrophobic conditions in the soil, thus improving water penetration. However, scientific studies have shown that these products do not appear to be removing as much organic matter as claimed. Additionally, the need for frequent applications contradicts the assertion that these products provide long-term solutions. Thus, these claims appear to be more of a marketing strategy than an accurate representation of the product's effects.

Future Research in Wetting Agents

Despite advances in understanding wetting agents, further research is essential. Scientists must continue exploring how these agents interact with different soil conditions and grass types. This ongoing research is crucial for developing more efficient and effective turf management practices.

Key Takeaways

The correct selection and use of wetting agents can significantly impact the health and appearance of turfgrass. It's essential to consider the type of grass, soil conditions, and specific turf requirements when choosing a wetting agent. Additionally, looking beyond marketing claims to understand the actual functionality of these products is crucial. Continued research and advancements in this field will undoubtedly lead to even more effective solutions in the future.