Abstract:
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.
摘要:
在这项研究中,制备了一种新型的具有缓释氮特性的环保型富尿素海藻酸钠基水凝胶,并对其在不同水分胁迫水平下的番茄植株栽培效果进行了评价。通过FTIR研究了水凝胶的结构和性能,XRD,TGA,DTG,和SEM。溶胀和释放实验表明,制备的富含尿素的水凝胶表现出高持水能力(412±4g/g),并表现出持续和缓慢的氮释放性能。在两个水分亏缺水平(30%和70%,基于所需的水灌溉)下使用两个水凝胶水平(0.1和0.5重量%)进行温室盆栽实验。发芽试验表明,开发的水凝胶肥料没有植物毒性,即使在缺水条件下也对发芽率有积极影响。施用0.5wt%的水凝胶肥料显著(p>0.05)提高了植物生长参数如叶片数,叶绿素含量,阀杆直径,和与对照处理相比的植物长度。对水凝胶肥料施用的响应程度取决于施用的水凝胶肥料的浓度和胁迫严重程度,对番茄的生长和产量的影响最大,为0.5%。番茄产量显著提高19.58%-12.81%,18.58%-22.02%,和39.38%-43.18%的植物用0.1-0.5wt%的水凝胶修正,并在0,30和70%的水分亏缺水平下生长,分别,与对照治疗相比。