Scientists, extensions specialists, and growers are seeking sustainable agricultural practices that are able to cope with these objectives in order to ensure global food security and minimize environmental damage. The use of mulching films and plant biostimulants in agriculture seems to be a valid solution for tackling these rising concerns. A greenhouse experiment was conducted in order to elucidate the morpho-physiological and nutritive characteristics of lettuce (Lactuca sativa L.) in response to foliar application of a tropical plant extract (PE) biostimulant and the use of plastic mulches. Two biodegradable mulch treatments (Mater-Bi^® 1 and Mater-Bi^® 2) were compared to black polyethylene (LDPE) and bare soil. Biodegradable mulch film Mater-Bi^® 1 produced a comparable marketable fresh yield to the commercial standard polyethylene (LDPE), whereas Mater-Bi^® 2 exhibited the highest crop productivity. When averaged over biostimulant application, lettuce plants grown with biodegradable film Mater-Bi^® 2 exhibited superior quality traits in terms of K, Ca, total ascorbic acid, and carotenoids content. The combination of film mulching (LDPE, Mater-Bi^® 1 or Mater-Bi^® 2) with the tropical plant extract biostimulant exhibited a positive and significant synergistic effect (+30%) on yield. The PE-biostimulant induced higher values of SPAD index and total chlorophyll content when compared to untreated greenhouse lettuce. The mineral content of leaf tissues was greater by 10% and 17% (for P and Ca, respectively) when compared to the untreated lettuce (no PE application). Nitrate content was significantly reduced by 23% in greenhouse lettuce plants receiving PE as compared to the untreated control. The positive effect of Mater-Bi^® 2 film on the ascorbic acid content has also been highlighted when combined with the biostimulant application, where a major amplification of total ascorbic acid (+168%) was recorded in comparison to the untreated lettuce. Overall, our work can assist leafy vegetables growers in adopting good agricultural practices, such as biodegradable plastic mulches and vegetal-derived biostimulants, to improve the sustainability of greenhouse production.

中文翻译：

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评价可生物降解的覆盖膜和植物衍生的生物刺激剂，以提高生菜产量和营养价值，是生态可持续的做法

科学家，推广专家和种植者正在寻求能够满足这些目标的可持续农业实践，以确保全球粮食安全并最大程度地减少环境破坏。在农业中使用覆盖膜和植物生物兴奋剂似乎是解决这些日益严重的问题的有效解决方案。为了阐明生菜（Lactuca sativa L.）的叶面施用热带植物提取物（PE）生物刺激剂和使用塑料覆盖物，进行了温室实验，以阐明莴苣的形态生理和营养特性。两个生物可降解的覆盖处理（母校碧^® 1和母校碧^® 2）进行比较，以黑色聚乙烯（LDPE）和裸露的土壤。生物降解覆盖膜Mater-Bi^® 1中产生可比较的适销新鲜收率市售的标准聚乙烯（LDPE），而母校碧^® 2表现出最高的作物产量。当通过生物刺激的应用平均化，莴苣植株生长与可生物降解的薄膜的Mater-碧^®在钾，钙，总抗坏血酸，和类胡萝卜素含量方面2个显示出优异的品质性状。的地膜覆盖（LDPE，母校碧组合^® 1或母校碧^®2）与热带植物提取物相比，生物刺激剂对产量表现出积极且显着的协同效应（+ 30％）。与未经处理的温室生菜相比，PE生物刺激剂诱导的SPAD指数和总叶绿素含量更高。与未经处理的生菜（不施用PE）相比，叶组织的矿物质含量分别高10％和17％（分别用于P和Ca）。与未处理的对照相比，接受PE的温室莴苣植物中的硝酸盐含量显着降低了23％。母校碧的积极作用^®当与生物刺激剂组合使用时，抗坏血酸含量上的2个薄膜也被突出显示，与未处理的生菜相比，总抗坏血酸的主要扩增（+ 168％）被记录下来。总体而言，我们的工作可以帮助多叶蔬菜种植者采用良好的农业规范，例如可生物降解的塑料覆盖物和植物源性生物兴奋剂，以提高温室生产的可持续性。