Zinc is one of the most important micronutrients used in agriculture, especially in tropical soils that are Zn-deficient and thus adsorb Zn applied from fertilizer, making it less available to plants, a problem that causes plant deficiencies. Therefore, slow-release systems are an alternative to minimize the sorption process of micronutrients in soil and ensure their availability to plants. In this work, micronutrient delivery systems comprised of Zn-loaded poly(butylene adipate‐co‐terephthalate) (PBAT) nanofibers were prepared by solution blow spinning (SBS). Scanning electron microscopy (SEM) results showed that by controlling process variables such as Zn content, air pressure and polymer concentration, PBAT nanofibers with diameters ranging from 306 to 380 nm were produced. Nanofibers properties were also studied by x-ray diffraction (XRD) and thermal analyses (TGA and DSC). Zinc addition reduced both the crystallinity and thermal properties of the nanofibers. The Zn release profiles in water were much slower in comparison with the control (ZnSO4) fertilizer. Maize (Zea mays) with and without slow-release systems were cultivated to assess their effect on plant nutrition and shoot yield. Nanofibers were efficient in releasing Zn in order to meet its nutritional demands. Zinc application via nanofiber promoted dry mass production similar to the control, even at the lowest doses applied, which helped increase Zn availability in soil. Results demonstrated that the spun PBAT nanofibers slowly released Zn to the soil in a controlled fashion, demonstrating that the Zn release systems developed can be used as a promising tool to improve the efficiency of fertilizers in agriculture.

中文翻译：

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使用通过溶液吹塑获得的可生物降解 PBAT 纳米纤维的玉米锌缓释系统

锌是农业中使用的最重要的微量营养素之一，尤其是在缺锌的热带土壤中，因此会吸收肥料中施用的锌，从而减少植物对锌的利用，这是导致植物缺锌的问题。因此，缓释系统是减少土壤中微量营养素吸附过程并确保它们对植物的可用性的替代方案。在这项工作中，通过溶液吹塑（SBS）制备了由负载锌的聚（己二酸丁二醇酯-共对苯二甲酸酯）（PBAT）纳米纤维组成的微量营养素输送系统。扫描电子显微镜 (SEM) 结果表明，通过控制 Zn 含量、气压和聚合物浓度等工艺变量，生产出直径范围为 306 至 380 nm 的 PBAT 纳米纤维。纳米纤维的特性也通过 X 射线衍射 (XRD) 和热分析 (TGA 和 DSC) 进行了研究。添加锌降低了纳米纤维的结晶度和热性能。与对照（ZnSO4）肥料相比，水中的锌释放曲线要慢得多。种植有和没有缓释系统的玉米 (Zea mays) 以评估它们对植物营养和芽产量的影响。纳米纤维可有效释放锌以满足其营养需求。通过纳米纤维施用锌促进了与对照相似的干大规模生产，即使在施用的最低剂量下，这也有助于增加土壤中锌的可用性。结果表明，纺成的 PBAT 纳米纤维以可控的方式将 Zn 缓慢释放到土壤中，