Different types of structures and substrates are used for urban extensive green roofs. However, there is not enough information about the performance of these structures and substrates for growing edible plants in tropical climate conditions. This study evaluates the best combination of three different modular extensive green roof structures and two types of local substrates (compost and soil + biochar) for Lactuca sativa L. var. crispa (lettuce) gowth. Physicochemical and biological properties of substrates and growth variables of plants were measured for the different green roof structures, at the beginning and at the end of the experiment (seven weeks after), and under rainy and dry climatic conditions. According to the model obtained, the monolithic multilayer structure, high concentrations of Mg, elevated amounts of 600 µm aggregates and less substrate bulk density were linked with a higher L. sativa yield. The substrate used, however, was not associated with this result. Additionally, it was found that some of the physicochemical and microbiological properties of substrates changed at the end of the experiment. However, these properties were dependent on climatic conditions. It is recommended to use the monolithic multilayer green roof structure and a substrate with added biochar for higher L. sativa yield. Further evaluations of this structure and substrate for other edible plants may be useful for supporting vulnerable people and enhancing agroecological functions of green roofs in Latin-America.

不同类型的结构和基材用于城市广阔的绿色屋顶。但是，关于这些结构和基质在热带气候条件下生长可食用植物的性能，没有足够的信息。本研究评估了三种不同的模块化广泛的屋顶绿化结构和两种类型的本地基板的最佳组合（堆肥和土壤生物炭+）的莴苣L.var。薄脆饼干（生菜）。在实验的开始和结束时（七周后）以及在阴雨和干燥的气候条件下，针对不同的绿色屋顶结构，测量了基质的理化和生物学特性以及植物的生长变量。根据获得的模型，整体式多层结构，高浓度的Mg，增加的600 µm聚集体数量和较低的基质堆积密度与较高的L. sativa有关。屈服。但是，所使用的底物与该结果无关。另外，发现在实验结束时底物的某些物理化学和微生物学性质发生了变化。但是，这些特性取决于气候条件。建议使用整体式多层绿色屋顶结构和添加生物炭的基质，以提高苜蓿的产量。对其他食用植物的这种结构和基质的进一步评估对于支持拉丁美洲的脆弱人群和增强屋顶绿化的农业生态功能可能是有用的。