Gao Hui, Fu Yuli, Wang Tianyu, Liu Meijia, Mao Jianzhen, Xu Feng
State Key Laboratory of Green Papermaking and Resource Recycling, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China.
Key Laboratory of Paper Science and Technology of Ministry of Education, Faculty of Light Industry, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China.
Polymers (Basel). 2025 May 7;17(9):1280. doi: 10.3390/polym17091280.
3,4-dimethylpyrazole (DMPZ), when used as a nitrification inhibitor, exhibits volatility, poor thermal stability, high production costs, and limited functionality restricted to nitrogen fixation. To address these limitations and introduce novel phosphorus-solubilizing and soil-loosening abilities, herein, a poly (acrylamide--acrylic acid)-encapsulated NI (P(AA--AM)--NI) is synthesized by incorporating linear P(AM--AA) macromolecular structures into NI systems. The P(AA--AM)--NI demonstrates an obvious phase transition from a glassy state to a rubbery state, with a glass transition temperature of ~150 °C. Only 5 wt% of the weight loss occurs at 220 °C, meeting the temperature requirements of the high-tower melt granulation process (≥165 °C). The DMPZ content in P(AA--AM)--NI is 1.067 wt%, representing a 120% increase compared to our previous products (0.484 wt%). P(AA--AM)--NI can effectively reduce the abundance of ammonia-oxidizing bacteria and prolong the duration during which nitrogen fertilizers exist in the form of ammonium nitrogen. It can also cooperatively enhance the conversion of insoluble phosphorus into soluble phosphorus in the presence of ammonium nitrogen (NH-N). In addition, upon adding P(AA--AM)--NI into soils, soil bulk density and hardness decrease by 9.2% and 10.5%, respectively, and soil permeability increases by 10.5%, showing that it has a good soil-loosening ability and capacity to regulate the soil environment.
3,4-二甲基吡唑（DMPZ）用作硝化抑制剂时，具有挥发性、热稳定性差、生产成本高以及仅限于固氮的功能有限等问题。为了解决这些局限性并引入新型的解磷和松土能力，在此，通过将线性P（AM-AA）大分子结构引入NI体系中，合成了一种聚（丙烯酰胺-丙烯酸）包裹的NI（P（AA-AM）-NI）。P（AA-AM）-NI表现出从玻璃态到橡胶态的明显相变，玻璃化转变温度约为150℃。在220℃时仅发生5 wt%的重量损失，满足高塔熔体造粒工艺的温度要求（≥165℃）。P（AA-AM）-NI中DMPZ的含量为1.067 wt%，与我们之前的产品（0.484 wt%）相比增加了120%。P（AA-AM）-NI可以有效降低氨氧化细菌的丰度，并延长氮肥以铵态氮形式存在的持续时间。在铵态氮（NH-N）存在的情况下，它还可以协同增强不溶性磷向可溶性磷的转化。此外，将P（AA-AM）-NI添加到土壤中后，土壤容重和硬度分别降低了9.2%和10.5%，土壤渗透率提高了10.5%，表明它具有良好的松土能力和调节土壤环境的能力。
