ENVIRONMENTAL CONNECTION / THIRD QUARTER 2025 / IECA.ORG 23 germination rates, both in previously seeded areas with lower initial germination and in newly hydroseeded zones. In areas with low germination, agreements were made with clients to reapply hydroseeding to ensure uniform vegetation coverage. or evening watering to retain soil moisture longer. In some cases, nighttime hydroseeding was carried out using equipment mounted on a railway platform. Frequent rainfall from mid-June through late September significantly improved Figure 3. Average rainfall registered in 2024 for Campeche, Quintana Roo and Yucatán states. Graphic credit: Servicio Meteorológico Nacional Mexico, 2024. When the rainy season began, the tackifier in the hydroseeding mix was increased to enhance soil adhesion. This approach successfully prevented runoff losses on embankments. In the Tulum section, coconut fiber blankets were installed after hydroseeding (Figure 9), while in the Playa del Carmen section, hydroseeding was applied over pre-installed coconut fiber mats. In rocky areas and Tai walls, a two-layer application was implemented: • The first layer consisted primarily of organic matter and tackifier. • This was followed by a second layer containing mulch, seeds, fertilizer, tackifier and polymer gel. Germination and grass growth on embankment slopes, which constitute 95% of the hydroseeded areas, were successful, given the challenging soil conditions. Additionally, the organic matter and fertilizers improved soil quality, which promoted the emergence of native plant species. Figure 10 shows a beforeand-after comparison. Steeper cut slopes with three-dimensional mesh showed lower germination due to their vertical nature and lack of permeable soil structure, which increased evapotranspiration and required more frequent irrigation. On Tai walls, germination and growth were more successful, particularly during the rainy season, although growth declined as rainfall decreased. Throughout 2025, ongoing monitoring of hydroseeded areas will be conducted to analyze vegetation succession dynamics, Figure 4. Average temperature in 2024 for Campeche, Quintana Roo and Yucatan states. Source: Servicio Meteorológico Nacional Mexico, 2024. Material Quantities Hydromulch 2,400 lb (1,088 kg) Seeds 105 lb (47.62 kg) Fertilizer 300 lb (136 kg) Gel polymer 3 lb (1.36 kg) Mycorrhiza 0.44 lb (0.200 kg) Organic matter 400 lb (181.4 kg) Figure 5. Amount of materials used in the hydroseeding mix per acre. >> INTERNATIONAL PEER REVIEW
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