The growing demand for sustainable agricultural practices necessitates the development of advanced fertilizer additives that improve nutrient use efficiency while minimizing environmental risks. This study reports the successful synthesis and evaluation of a novel thermally stable polymer nitrification inhibitor (PNI) derived from acrylic acid (AA) and 3,4-dimethylpyrazole (DMPZ). The PNI was synthesized via a controlled free-radical polymerization process using a self-made composite initiator, enabling oxygen-free conditions without the need for inert gas shielding. The resulting product exhibited high thermal resistance with a glass transition temperature (Tg) of 78 °C and an effective decomposition temperature (Td) of 216 °C, making it highly suitable for high-temperature processing techniques such as high-tower granulation. Fourier-transform infrared spectroscopy (FTIR) confirmed the presence of characteristic peaks corresponding to C=C (1646 cm⁻¹), CN (1455 cm⁻¹), and COO⁻ (1546 and 1405 cm⁻¹), indicating successful polymerization of AA and complexation with DMPZ. X-ray diffraction (XRD) analysis revealed an amorphous structure with a broad peak centered at 2θ = 20.3°, consistent with lack of long-range molecular order. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) further validated the material’s thermal stability, showing minimal weight loss below 200 °C and a residual char yield of 23% at 800 °C. These properties ensure structural integrity during industrial manufacturing and field application.
Performance in Nitrogen Retention and Nitrification Inhibition
The primary function of any nitrification inhibitor is to delay the conversion of ammonium nitrogen (NH₄⁺-N) to nitrate nitrogen (NO₃⁻-N), thereby reducing leaching and denitrification losses. In this study, the PNI demonstrated excellent nitrification inhibition performance when applied at 0.5 wt% relative to urea. Closed-bottle experiments at 40 °C showed that NH₃ volatilization from the PNI-treated soil reached 140 ppm after 18 hours—exceeding the upper detection limit of standard tubes—indicating sustained suppression of nitrification. In comparison, the blank control released only 55 ± 11 ppm, while DMPP-treated samples reached 130 ± 8 ppm. The delayed release of ammonia confirms that the PNI effectively immobilizes ammonium ions by inhibiting the activity of ammonia-oxidizing bacteria (AOB). This prolonged retention enhances nitrogen availability over time, aligning better with crop uptake patterns. Furthermore, the PNI’s ability to maintain bioactivity even after exposure to elevated temperatures suggests its potential for use in heat-intensive fertilizer production processes without degradation.ACTR3 Antibody Autophagy The integration of DMPZ into a stable polymer matrix prevents rapid leaching or volatilization of the active ingredient, ensuring longer-lasting efficacy in the soil environment.MICA+MICB Antibody Epigenetic Reader Domain
Phosphate-Solubilizing Capacity and Dual Nutrient Management
Beyond nitrogen management, modern fertilizers must also support phosphorus availability.PMID:35203926 Traditional nitrification inhibitors lack phosphate-solubilizing capability, limiting their functional scope. The developed PNI addresses this gap by exhibiting strong phosphate-solubilizing activity. When tested with insoluble calcium phosphate, the addition of PNI at a volume ratio of 1:1000 led to complete dissolution of the white precipitate within just 5 seconds. This rapid solubilization is attributed to the carboxylate groups from polymerized acrylic acid, which chelate calcium ions and disrupt the stable phosphate lattice. Residual COOH groups, identified by FTIR at 3457 cm⁻¹, contribute to ion exchange and enhanced solubility. This dual functionality enables simultaneous nitrogen immobilization and phosphorus activation, offering a synergistic solution for balanced nutrient delivery. The PNI can be directly incorporated into compound fertilizers, liquid formulations, or water-soluble blends, where it supports both nitrogen retention and phosphorus mobilization. Field applications show promise in improving crop yields in calcareous and low-phosphorus soils. By combining two critical functions into one additive, the PNI reduces the need for multiple amendments, simplifies formulation, and enhances overall fertilizer efficiency. Its robust thermal stability ensures compatibility with diverse manufacturing processes, paving the way for scalable industrial adoption.MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com