• ISSN 1008-505X
  • CN 11-3996/S
何锐, 谭星, 高美芳, 张轶婷, 宋世威, 苏蔚, 刘厚诚. 添加不同浓度海藻肥对水培芥蓝生长及品质的影响[J]. 植物营养与肥料学报, 2020, 26(11): 2051-2059. DOI: 10.11674/zwyf.20247
引用本文: 何锐, 谭星, 高美芳, 张轶婷, 宋世威, 苏蔚, 刘厚诚. 添加不同浓度海藻肥对水培芥蓝生长及品质的影响[J]. 植物营养与肥料学报, 2020, 26(11): 2051-2059. DOI: 10.11674/zwyf.20247
HE Rui, TAN Xing, GAO Mei-fang, ZHANG Yi-ting, SONG Shi-wei, SU Wei, LIU Hou-cheng. Effects of different concentrations of seaweed extract on growth and quality of Chinese kale in hydroponics[J]. Journal of Plant Nutrition and Fertilizers, 2020, 26(11): 2051-2059. DOI: 10.11674/zwyf.20247
Citation: HE Rui, TAN Xing, GAO Mei-fang, ZHANG Yi-ting, SONG Shi-wei, SU Wei, LIU Hou-cheng. Effects of different concentrations of seaweed extract on growth and quality of Chinese kale in hydroponics[J]. Journal of Plant Nutrition and Fertilizers, 2020, 26(11): 2051-2059. DOI: 10.11674/zwyf.20247

添加不同浓度海藻肥对水培芥蓝生长及品质的影响

Effects of different concentrations of seaweed extract on growth and quality of Chinese kale in hydroponics

  • 摘要:
    目的 研究不同浓度海藻肥对水培芥蓝生长、营养品质及矿质元素含量的影响,以期筛选出适合水培芥蓝高效生产的海藻肥浓度。
    方法 以‘绿宝’芥蓝为试验材料,于华南农业大学设施园艺试验基地进行两次水培试验。试验所用的营养液配方均为1/2霍格兰营养液配方,首先进行了稀释浓度预备试验,设置添加稀释800倍 (C1)、1000倍 (C2)、1200倍 (C3) 海藻肥,每周添加一次,生长期为32天。然后,在预备试验基础上,进一步加大了稀释倍数,且只在试验开始时添加一次海藻肥,生长期内不再更换营养液。添加海藻肥浓度分别为稀释1200倍 (T1)、1400倍 (T2)、1600倍 (T3)、1800倍 (T4)、2000倍 (T5)。调查分析了芥蓝的生长状况及营养品质 (可溶性糖、可溶性蛋白、硝酸盐和维生素C含量)、抗氧化品质 (DPPH、FRAP、总多酚和总类黄酮含量)、硫苷含量及矿质元素等的变化。
    结果 营养液中添加的海藻肥浓度影响其对芥蓝生长的效果,预备试验的3个浓度处理均显著降低了芥蓝的株高,最终降低了芥蓝的地上部鲜重,稀释800倍和1000倍处理的副作用显著大于稀释1200倍。在主试验中,芥蓝生长和品质对海藻肥的浓度十分敏感,只有稀释倍数为1400倍和1600倍的海藻肥处理明显提高了芥蓝的叶片数和地上部鲜重,其他稀释倍数没有明显效果。海藻肥稀释1400倍时,可以显著提高芥蓝中总硫苷含量,增加芥蓝中FRAP值、多酚与类黄酮含量,增强芥蓝抗氧化能力,其他稀释倍数处理的效果均不明显。
    结论 水培芥蓝对营养液中添加的海藻肥的浓度十分敏感,过高会显著降低芥蓝的生长和生物量,过低对产量和品质的提高效果不明显。当供试海藻肥在营养液中的适宜稀释倍数为1400倍时,可以显著提高芥蓝的生长和生物量,增加叶片中的光合色素含量,提高营养品质,降低硝酸盐含量,提高植株的抗氧化力;而且在生长初期添加一次海藻肥后,整个生育期无需更换营养液,极大地简化了管理成本。

     

    Abstract:
    Objectives Experiments were conducted to investigate the effects of different concentrations of seaweed extract on the yield and quality of hydroponic Chinese kale (Brassica alboglabra Bailey) in greenhouse.
    Methods The hydroponic experiments were carried out in Horticultural Experiment Base in South China Agricultural University. The initial nutrient solution was 1/2 strength Hoagland solution. In the preliminary experiment, the tested seaweed extract fertilizer was diluted by 800, 1000 and 1200 folds in the nutrient solution, respectively, which was refreshed once a week. According to the results of the preliminary experiment, the seaweed extract was diluted by 1200, 1400, 1600, 1800 and 2000 folds in the nutrient solution in the following main experiment, and the nutrient solutions would not be changed during the whole experiment. The plant biomass was measured, and the contents of soluble sugar, soluble protein, nitrate and vitamin C were determined, and the 2, 2-diphenyl-1-picrylhydrazyl, ferric-reducing antioxidant power, contents of total phenolics, total flavonoids, glucosinolates and mineral elements of Chinese kale were analyzed.
    Results In the primary experiment, the three dilution treatments all inhibited the growth and the biomass of Chinese kale significantly, and the dilution folds of 800 and 1000 decreased significantly more than that of 1200 fold. In the main experiment, the plant growth and quality showed extremely sensitive to the concentration of seaweed extracts. The growth and biomass of Chinese kale only increased significantly in treatments of 1400 and 1600 dilution, and the contents of nitrogen, phosphorus, calcium, potassium and sulfur, the contents of total phenolic compounds, total flavonoids and FRAP, the antioxidant capacities merely increased significantly in dilution treatment of 1400 fold, all above were not affected in other dilution treatments.
    Conclusions The hydroponic Chinese kale is extremely sensitive to the concentration of seaweed extract in the nutrient solution. Over high concentration of seaweed extract will inhibit the growth and biomass of Chinese kale significantly, while too low concentration would not have the expected promotion effects. When the tested seaweed extract is diluted by 1400 folds in the nutrient solution, it will stimulate the growth and biomass accumulation, enhance the photosynthetic pigment contents, the nutrition quality and the anti-oxidance ability. In addition, adding seaweed extract once at the initial will not need changing the nutrient solution during the whole culture period.

     

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