Eco-friendly glassy-salt NPK fertilizer compositions with controlled solubility
Lehigh University introduces eco-friendly NPK fertilizer compositions using glassy-salt technology. These fertilizers offer controlled nutrient release, enhancing nitrogen use efficiency (NUE) and sustainability. Suitable for agricultural applications, they are currently at TRL 4.
Overview
Lehigh University presents an innovative approach to fertilizer technology with eco-friendly, engineered glassy-salt NPK fertilizer compositions. Utilizing calcium-potassium-sodium ternary nitrates, these fertilizers are designed for controlled solubility in soil, making them ideal for sustainable agriculture. The unique glass-crystal composites are prepared at low temperatures without carbonates, retaining essential nutrients and offering a slower nutrient release, enhancing nitrogen use efficiency (NUE).
Technical specifications
Key features:
- Composed of zNH4H2PO4 - x[a(KNO3)2 - b(NaNO3)2] - cKHSO4 - (1-x)Ca(NO3)2
- Melt at temperatures below 300°C, retaining nitrogen
- Non-hygroscopic and controllable solubility in water
- Optimized through composition and process adjustments for targeted release rates
- Advanced characterization techniques used for material analysis
Technology readiness level
This technology is currently at TRL 4, indicating a successful proof of concept with ongoing optimization and validation through greenhouse testing. The aim is to further refine these compositions to improve their efficacy as controlled-release fertilizers, validated by their impact on lettuce plant growth and nutrient delivery efficiency.
About Lehigh University
Lehigh University is a private, mid-sized research university in Bethlehem, Pennsylvania focused on interdisciplinary, hands-on problem solving. A multi-campus footprint includes a research campus with co-located labs, instrumentation, and prototyping spaces for rapid iteration with industry. Corporate engagement staff streamline sponsored research, capstones, internships, and short courses, and an on-campus incubator links partners to startup pipelines. Proximity to New York City and Philadelphia enables collaboration with regional manufacturers, logistics leaders, and growth-stage firms. Faculty secure competitive federal funding from agencies such as the NSF and DOE, and a technology transfer office supports IP, licensing, and new venture formation.
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