PDF(Pubmed)
Abstract：
Energy cane (Saccharum spp.) bagasse, a type of biomass waste, is often underutilized, burned, or left to dispose of itself. This research aimed to evaluate the potential of converting this bagasse into high-value cellulosic microfiber hydrogels (CMH) for water conservation and potted chili (Capsicum annuum) plant growth. CMH offers a biodegradable alternative to synthetic polyacrylamide (PA) hydrogels and provides the dual benefit of improved water use efficiency and reduced environmental impact due to their ability to naturally break down in the soil. In this study, CMH and PA hydrogels were compared for water retention value (WRV), and reswelling kinetics (RK), as well as their effects on plant height, leaf count, root-to-shoot ratios (R:S ratio), and soil moisture retention. Two versions of CMH, CMH65 and CMH60, were prepared with varying cellulose-chitosan ratios: 65:35 and 60:40, respectively. The hydrogels were tested at four concentrations (0, 0.5, 1.0, and 2.0% w/w) by being mixed in Promix® soil. Observations were recorded over a 16-day period without additional water. Also, the WRV of hydrogels at 240 min and RK (10-180 min) were compared over three swelling-deswelling cycles. The PA hydrogel exhibited higher WRV (exceeding 450%) compared to CMH (45%). However, PA led to reduced plant height, leaf count, and R:S ratio when compared to higher concentrations of CMH65 and CMH60. In general, CMH60 (0.5% and 2%) exhibited superior plant growth. All hydrogels exhibited a significant decrease (p < 0.05) in WRV across successive cycles. Notably, during cycle 2, both CMH65 and CMH60 peaked in WRV at 10 and 20 min, respectively, compared to cycle 1. This study demonstrates the potential of bagasse-derived hydrogels as a value-added product for water conservation and crop growth.
摘要：
能源甘蔗（甘蔗属。)甘蔗渣，一种生物质废物，经常被充分利用，烧毁,或者任由自己处理。这项研究旨在评估将这种甘蔗渣转化为高价值的纤维素微纤维水凝胶（CMH）用于节水和盆栽辣椒（Capsicumannuum）植物生长的潜力。CMH为合成聚丙烯酰胺（PA）水凝胶提供了一种可生物降解的替代品，并且由于其在土壤中自然分解的能力，提供了提高水利用效率和减少环境影响的双重好处。在这项研究中,比较了CMH和PA水凝胶的保水值（WRV），和重振动力学(RK)，以及它们对植物高度的影响，叶数,根冠比（R：S比），和土壤水分保持。CMH的两个版本，CMH65和CMH60分别用不同的纤维素-壳聚糖比率:65:35和60:40制备。通过在Promix®土壤中混合以四种浓度(0、0.5、1.0和2.0%w/w)测试水凝胶。在没有额外水的情况下,在16天期间记录观察结果。此外，在三个溶胀-去溶胀循环中比较了水凝胶在240分钟时的WRV和RK（10-180分钟）。与CMH(45%)相比,PA水凝胶表现出更高的WRV(超过450%)。然而,PA导致植物高度降低，叶数,当与较高浓度的CMH65和CMH60相比时,R:S比率。总的来说,CMH60（0.5％和2％）表现出优异的植物生长。所有水凝胶在连续循环中表现出WRV的显著降低(p<0.05)。值得注意的是,在周期2期间，CMH65和CMH60在WRV中在10和20分钟达到峰值，分别,与周期1相比。这项研究证明了甘蔗渣衍生的水凝胶作为节水和作物生长的增值产品的潜力。
