ABSTRACT

This study describes the use of spray drying technology to obtain a powder containing biomolecules with herbicidal activity produced by submerged fermentation using Diaporthe schini. The efficiency of the bioherbicide was tested for the post-emergence control of Bidens pilosa L., Amaranthus viridis L., Echinochloa crusgalli (L.) Beauv., and Lolium multiflorum Lam. In the first step, different additives were used and lactose was the most suitable one because it resulted in high herbicidal activity and weed suppression. In the second step, process variables were investigated, including inlet air temperature, drying air flow rate, and feed flow rate. The highest herbicidal activity was obtained with an inlet air temperature of 100°C, and air and feed flow rates of 1.4 m³/min and 0.22 L/h, respectively. Maximum herbicidal activities were 38, 45, 21 and 18%, while weed heights reduction were 69.0, 74.3, 20.4 and 24.8% for B. pilosa, A. viridis, E. crusgalli and L. multiflorum, respectively. The bioherbicide was effective to suppress weed growth and spray drying is a promising technology for the production of solid formulations of bioherbicides.

摘要

本研究描述了使用喷雾干燥技术获得含有具有除草活性的生物分子的粉末，该粉末是使用Diaporthe schini通过深层发酵生产的。测试了该生物除草剂对白毛茛、Amaranthus viridis L.、Echinochloa crusgalli ( L.) Beauv.和黑麦草的出苗后防治效果我是。在第一步中，使用了不同的添加剂，乳糖是最合适的添加剂，因为它具有很高的除草活性和杂草抑制作用。在第二步中，研究了工艺变量，包括入口空气温度、干燥空气流速和进料流速。入口空气温度为 100°C，空气和进料流速分别为 1.4 m ³ /min 和 0.22 L/h 时，除草活性最高。B. pilosa、A. viridis、E. crusgalli和L. multiflorum的最大除草活性分别为 38、45、21 和 18%，而杂草高度降低分别为 69.0、74.3、20.4 和 24.8%， 分别。生物除草剂可有效抑制杂草生长，喷雾干燥是生产生物除草剂固体制剂的有前景的技术。