Preparation and performance of a kitchen waste oil-modified polyvinyl alcohol-grafted urea slow-release fertilizer

Slow-release fertilizers (MSRFs) are effective in improving fertilizer utilization and reducing environmental fertilizer pollution. In this study, polyvinyl alcohol (PVA) was modified with kitchen waste oil (KWO) and grafted with urea to prepare a urea MSRF. FTIR, Scanning electron microscopy, X-ray diffraction and water contact angle were used to study the MSRF structure and properties. The effects of the nitrogen content on its properties were also investigated through release performance and degradation behavior evaluation and plant experiments. The results showed that the oil-based polyalcohol-modified PVA (OPMPVA) solution prepared from KWO had good compatibility with the urea-modified compound hydroxylurea, and the prepared MSRF had good hydrophobicity, degradation and slow-release properties. The nutrient release period reached more than 20 days, and the degradation rate after 30 days reached 10.2%. Plant experiments showed that the MSRF prepared in this research has good application potential, and the utilization of nitrogen nutrients was improved.

Automated summary

In this study, a urea MSRF was prepared by modifying PVA with kitchen waste oil and grafting urea onto it. The MSRF showed good hydrophobicity, degradation, and slow-release properties, with a nutrient release period of over 20 days and a degradation rate of 10.2% after 30 days. Plant experiments demonstrated the potential application of the MSRF in improving nitrogen nutrient utilization.