背景:由于其对作物的有益作用,植物衍生的蛋白质水解产物(PH)已被认为是可持续的生物刺激剂产品。然而,大多数关于PHs的研究都是在硝酸盐与铵的固定比例(NO3-:NH4+)下进行的,而不考虑其他氮素应用场景,导致研究结果不一致。这项研究比较了N水平(2或10mMN)的影响,NO3:NH4比率(100:0、75:25、50:50或25:75),和PH应用方法-控制,叶面喷雾(PH-F)或根施(PH-R)-对产量,形态学,营养素,水培生菜的营养品质。
结果:氮含量,NO3:NH4比例,和PH应用影响植物生长,形态学,和质量显著,强调这些因素之间相互作用的重要性。芽生长受NO3:NH4比率的影响,PH,和他们的互动。在叶绿素含量中观察到类似的趋势。所有三个因素之间的相互作用显着影响根的生长和形态。根施(PH-R)可保护莴苣免受低NO3:NH4比率引起的产量损失以及高N水平引起的抗氧化剂化合物减少的影响。尽管PH和任何相互作用都不影响硝酸盐浓度,但植物来源的蛋白质水解产物通过双向和三向相互作用改善了养分吸收。
结论:这项研究表明,PH与N水平和NO3:NH4比率相互作用,影响水培莴苣的产量和品质。特别是,根施PH是提高产量(芽鲜重)的最有效方法,质量(叶绿素,类胡萝卜素,黄酮类化合物,和酚类),与氮素形式和水平有关的水培生菜的养分吸收。©2024化学工业学会。
BACKGROUND: Vegetal-derived protein hydrolysates (PHs) have been recognized as sustainable biostimulant products due to their beneficial effects on crops. However, most studies on PHs have been conducted at a fixed ratio of nitrate-to-ammonium (NO3 -:NH4 +) without considering other N application scenarios, leading to inconsistent results among the studies. This study compared the influences of N levels (2 or 10 mM N), NO3:NH4 ratios (100:0, 75:25, 50:50, or 25:75), and PH application methods - control, foliar spray (PH-F) or root application (PH-R) - on the yield, morphology, nutrients, and nutraceutical quality of hydroponic lettuce.
RESULTS: Nitrogen level, NO3:NH4 ratio, and PH application affected plant growth, morphology, and quality significantly, highlighting the importance of the interactions among these factors. Shoot growth was influenced by NO3:NH4 ratios, PH, and their interactions. Similar trends were observed in chlorophyll content. The interactions among all three factors significantly influenced root growth and morphology. Root application (PH-R) protected lettuce from yield loss caused by low NO3:NH4 ratios and from reduced antioxidant compounds caused by high N levels. Vegetal-derived protein hydrolysates improved nutrient uptake through two-way and three-way interactions although neither PH nor any interactions affected nitrate concentrations.
CONCLUSIONS: This study demonstrated that PH interacts with N level and NO3:NH4 ratio, affecting hydroponic lettuce yield and quality. In particular, the root application of PH was the most effective method for enhancing yield (shoot fresh weight), quality (chlorophylls, carotenoids, flavonoids, and phenols), and nutrient uptake in hydroponically grown lettuce in relation to N form and level. © 2024 Society of Chemical Industry.