Amending Sand with Isolite and Zeolite under Saline Conditions: Leachate Composition and Salt Deposition
The research paper investigates the effects of two inorganic soil amendments, isolite and zeolite, on turf quality and salt management in Kentucky bluegrass (Poa pratensis) under varying saline conditions. Conducted in greenhouse experiments, the study aimed to evaluate how these amendments influence turf quality and the leaching and deposition of salts in sandy soils subjected to three salinity levels (0.25, 3.5, and 6.5 dS·m–1).
The results indicated that saline irrigation negatively impacted turf quality, with zeolite showing a significant improvement in turf quality during the second and third months of treatment at both salinity levels. In contrast, isolite only improved turf quality during the third month under the highest salinity treatment. However, the beneficial effects of zeolite diminished over time, particularly after five to six months of treatment.
The study also revealed that amending sand with zeolite reduced the leaching of sodium (Na+) and potassium (K+), while increasing the leaching of calcium (Ca2+) and magnesium (Mg2+). This led to an increase in the sodium absorption ratio (SAR) values, indicating a potential long-term risk of sodicity and salinity problems due to the accumulation of Na+ in the root zone. Isolite was found to have a lower cation exchange capacity (CEC) and retained less Na+ and Ca2+ compared to zeolite.
Overall, the findings suggest that while zeolite can temporarily buffer Na+ concentration and improve turf quality, its long-term use under saline conditions may lead to increased salinity issues. The study provides valuable insights for turf management, particularly in selecting appropriate soil amendments for saline environments.
This research paper is significant in the field of horticulture and turf management, particularly for professionals dealing with saline soils and irrigation practices. It contributes to ongoing discussions about sustainable turf management by highlighting the potential benefits and drawbacks of using inorganic amendments like zeolite and isolite. The findings can guide turf managers in selecting appropriate soil amendments to mitigate salinity issues, thereby enhancing turf quality and sustainability. Additionally, the research underscores the importance of understanding the long-term implications of soil amendments on soil chemistry and plant health, which is crucial for effective turfgrass management in saline conditions.
