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外文期刊>Australian Journal of Crop Science
>Effect of seaweed (Ecklonia maxima) extract and legume-derived protein hydrolysate biostimulants on baby leaf lettuce grown on optimal doses of nitrogen under greenhouse conditions
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Effect of seaweed (Ecklonia maxima) extract and legume-derived protein hydrolysate biostimulants on baby leaf lettuce grown on optimal doses of nitrogen under greenhouse conditions
In recent years, the demand for green leafy vegetables is increasing.In order to satisfy this trend, the leafy crops are cultivated under high energetic input, especially high doses of nitrogen (N) fertilization that leads to a nitrate accumulation in leaves, sometimes overcoming the legal threshold set by the European Community for their commercialization.The nitrate in leaves can be dangerous for human health because in the human body it can be converted into nitrite, which can cause methemoglobinemia or create cancer-causing compounds.In order to overcome this problem, a correct N management is needed, especially using technical means which can improve the nitrogen use efficiency.In this study, we evaluated the possible effect of two important plant biostimulants on yield and quality traits (nitrate, antioxidants activity, carotenoids) of baby leafy lettuce, grown in a greenhouse with three levels of nitrogen input.Nitrogen doses were 0, 10 (sub-optimal) and 20 (optimal) kg ha-1, N0, N10 and N20 respectively.The biostimulants were Ecklonia maxima seaweed extract (3 ml per liter) (named Bio 1), legume-derived protein hydrolysate (Bio 2) and non-treated control (Control).The treatments were distributed in a randomized complete-block design with three replications (3 N levels x 3 Biostimulant applications x 3 replications).Biostimulant applications of seaweed extracts and legume-derived protein hydrolysate improved yield and LAI: 13.4% and 12.0% increase over non treated plants, respectively.The highest yield was reached at 20 kg N ha-1.Application of foliar biostimulants stimulated the antioxidant systems of plants, improved leaves color and increased chlorophyll and carotenoids content.The nitrate concentration in leaves was increased under higher levels of N fertilization, meeting the EC legal limit at N20 treatment in plants sprayed by E.maxima seaweed extract.Therefore, in our growth conditions, it seems possible to reduce nitrogen input at 10 kg N ha-1, by applying additional applications of biostimulants to reduce the yield gap upon application of N20 treatment.
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机译：近年来，对绿叶蔬菜的需求正在增加。为了满足这种趋势，叶茂作物在高能量输入下培养，尤其是高剂量的氮气（n）施肥，导致叶片中的硝酸盐积累，有时克服欧洲共同体为其商业化设定的法律门槛。叶片的硝酸盐对于人体健康可能是危险的，因为在人体中，它可以转化为亚硝酸盐，这会导致甲虫血症或产生癌症的化合物。在克服这一点问题，需要一个正确的N管理，特别是使用能够提高氮气使用效率的技术手段。在本研究中，我们评估了两个重要植物生物刺激剂对婴儿产量和质量性状（硝酸盐，抗氧化剂活性，类胡萝卜素）的可能效果。在一个温室里种植的叶状莴苣，三层氮气投入。润剂量为0,10（次优）和20（最佳）kg ha-1，n0分别为N10和N20。生物染色剂是Ecklonia Maxima海藻提取物（每升3ml）（命名生物1），豆类衍生的蛋白水解产物（Bio 2）和未处理的对照（对照）。治疗分布在随机化完整嵌段设计具有三种复制（3 n级X 3生物诱导应用x 3复制）。海藻提取物和豆科源蛋白水解产物的肥胖应用分别增加了产量和赖：13.4％和12.0％，增加未治疗的植物。在20kg n-1.携带的叶状生物刺激剂的应用中达到了最高产率刺激了植物的抗氧化剂系统，改善了叶片颜色和增加的叶绿素和类胡萝卜素含量。在较高水平的N施肥中，叶片中的硝酸盐浓度增加，会达到EC。 e.maxima海藻提取物喷洒的植物中N20治疗的法律限制。因此，在我们的生长条件下，似乎可以减少10 kg n ha-1，通过应用程序的氮气输入阐述了生物刺激剂的额外应用，以降低N20处理时的产量差距。
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