Effect of hydrogel composite reinforced with natural char nanoparticles on improvement of soil biological properties and the growth of water deficit-stressed tomato plant
Effect of hydrogel composite reinforced with natural char nanoparticles on improvement of soil biological properties and the growth of water deficit-stressed tomato plant
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DOI：
10.1016/j.ecoenv.2021.112576
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发表时间：
2021-07-30
影响因子：
6.8
通讯作者：
Motamedi, Elaheh
中科院分区：
文献类型：
--
作者：
Nassaj-Bokharaei, Sahar;Motesharezedeh, Babak;Motamedi, Elaheh
水凝胶聚合物已被用于增强农业土壤中的水和养分保持。近年来，将纳米颗粒掺入以产生复合水凝胶也获得了相当大的动力。研究了水凝胶-纳米天然炭复合材料（含天然炭纳米颗粒的增强淀粉基水凝胶）在0%、0.3%和0.6%（w/w）3个水平下对番茄（Lycopersicon esculentum Mill.）营养和形态反应的影响。以及50%持水量（严重胁迫）、75%持水量（轻度胁迫）和85%持水量（非胁迫）3个水平的水分亏缺胁迫对土壤生物学特性的影响。不同浓度的纳米复合材料和水分亏缺胁迫对植物形态营养指标和土壤微生物性状有显著影响（P < 0.05）。水分亏缺胁迫降低了该测定中的所有测量参数。然而，纳米复合材料的使用减少了水分亏缺胁迫对番茄生长发育的负面影响。对纳米复合材料处理的响应的大小取决于施加的纳米复合材料的浓度和应力的严重程度，对生长的影响最大（增加22-45%）和营养指数（P，Fe，锌浓度）在0.3%水凝胶纳米复合材料和85%WHC水平下，番茄的生长速率（增加16-29%）和土壤呼吸速率在0.6%水凝胶纳米复合材料和75%WHC的水平下，微生物种群大小（增加61%）和微生物种群大小（增加89%）。因此，建议将水凝胶-纳米天然炭复合物作为一种有前途的土壤改良剂，如果使用正确，可以是一种成功的方法，以保持土壤水分含量（改善番茄生长），植物养分和番茄生长介质中的土壤微生物活性。
Hydrogel polymers have been used to enhance water and nutrient retention in agricultural soils. The incorporation of nanoparticles to yield composite hydrogels has also gained substantial momentum over the years. The aim of the research was to investigate the effect of hydrogel-nano natural char composite (reinforced starchbased hydrogels with natural char nanoparticles) at three levels 0%, 0.3% and 0.6% (w/w) on nutritional and morphological responses of tomato plant (Lycopersicon esculentum Mill.) as well as on some soil biological properties under water-deficit stress at three levels 50% water-holding capacity (WHC) (severe stress), 75% WHC (mild stress), and 85% WHC (non-stress conditions). The different levels of nano-composite and water deficit stress significantly (P < 0.05) affected plant morpho-nutritional indices and soil microbial traits. Water-deficit stress decreased all measured parameters in this assay. However, the use of nanocomposite reduced the negative effects of water-deficit stress on tomato growth and development. The magnitude of the responses to the nanocomposite treatment depended on the concentration of applied nanocomposite and stress severity with the most positive effects on the growth (22-45% increase) and nutritional indices (P, Fe, and Zn concentration) (16-29% increase) of tomato at level 0.3% hydrogel nanocomposite and 85% WHC and on soil respiration rate (61% increase) and microbial population size ( 89% increase) at the level 0.6% hydrogel nanocomposite and 75% WHC. Accordingly, it is suggested that the application of hydrogel-nano natural char composite as a promising soil amendment, if used correctly, can be a successful method to maintain soil moisture content (improved tomato growth), plant nutrients, and soil microbial activity in the tomato growing medium.