Laboratory of Materials, Catalysis & Natural Resources Valorization, URAC 24, Faculty of Science and Technology, Hassan II University, B.P. 146 Casablanca, Morocco; MAScIR Foundation, VARENA Center, Mohammed VI Polytechnic University, Ben Guerir, Morocco.
Laboratory of Materials, Catalysis & Natural Resources Valorization, URAC 24, Faculty of Science and Technology, Hassan II University, B.P. 146 Casablanca, Morocco; MAScIR Foundation, VARENA Center, Mohammed VI Polytechnic University, Ben Guerir, Morocco.
Int J Biol Macromol. 2024 Jun;272(Pt 1):132814. doi: 10.1016/j.ijbiomac.2024.132814. Epub 2024 May 31.
In this study, a new eco-friendly urea-rich sodium alginate-based hydrogel with a slow-release nitrogen property was prepared, and its effectiveness was evaluated in the cultivation of tomato plants under different water stress levels. The structure and performance of the hydrogel were investigated by FTIR, XRD, TGA, DTG, and SEM. The swelling and release experiments showed that prepared urea-rich hydrogel exhibited a high-water holding capacity (412 ± 4 g/g) and showed a sustained and slow nitrogen release property. A greenhouse pot experiment was conducted using two hydrogel levels (0.1 and 0.5 wt%) under two water deficit levels (30 and 70 % based on required water irrigation). Germination tests indicated that the developed hydrogel fertilizer has no phytotoxicity and has a positive impact on the germination rate even under water deficit conditions. The application of hydrogel fertilizer at 0.5 wt% significantly (p > 0.05) enhanced plant growth parameters such as leaf number, chlorophyll content, stem diameter, and plant length compared to the control treatment. The magnitude of the responses to the hydrogel fertilizer application depended on the concentration of applied hydrogel fertilizer and stress severity with the most positive effects on the growth and yield of tomato observed at a level of 0.5 %. Tomato yield was significantly enhanced by 19.58 %-12.81 %, 18.58 %-22.02 %, and 39.38 %-43.18 % for the plant amended with hydrogel at 0.1-0.5 wt% and grown under water deficit levels of 0, 30, and 70 %, respectively, compared to the control treatment.
本研究制备了一种新型环保的富尿素海藻酸钠水凝胶，具有缓释氮特性，并评价了其在不同水分胁迫水平下番茄植株栽培中的效果。通过 FTIR、XRD、TGA、DTG 和 SEM 对水凝胶的结构和性能进行了研究。溶胀和释放实验表明，所制备的富尿素水凝胶具有高持水能力（412±4 g/g），并表现出持续缓慢的氮释放特性。在两个水分亏缺水平（基于所需灌溉水的 30%和 70%）下，采用温室盆栽试验，使用两种水凝胶水平（0.1 和 0.5 wt%）。发芽试验表明，所开发的水凝胶肥料无植物毒性，即使在水分亏缺条件下，也对发芽率有积极影响。与对照处理相比，水凝胶肥料用量为 0.5 wt%时，叶片数、叶绿素含量、茎径和植株长度等植物生长参数显著提高（p>0.05）。对水凝胶肥料应用的响应程度取决于应用水凝胶肥料的浓度和胁迫严重程度，在 0.5%的水平下，对番茄生长和产量的影响最为显著。与对照处理相比，在水分亏缺水平为 0、30 和 70%下，分别用 0.1-0.5 wt%水凝胶处理的植株的番茄产量提高了 19.58%-12.81%、18.58%-22.02%和 39.38%-43.18%。
