Department of Plant Production, College of Food and Agriculture Sciences, King Saud University, Riyadh, Saudi Arabia.
PeerJ. 2024 May 6;12:e17378. doi: 10.7717/peerj.17378. eCollection 2024.
Many citrus species and cultivars are grown successfully in tropical and subtropical countries, as well as in arid and semi-arid regions with low levels of organic matter and low cation exchange, resulting in lower nutrient uptake by the plant. The essential nutrients needed for citrus flowering and fruit set are limited in winter due to a reduction in transpiration rate, negatively effecting vegetative growth, flowering, yield, and fruit quality. The present investigation was carried out to assess the nutritional status, fruit yield parameters, and fruit quality of Valencia orange trees after foliar spraying of seaweed extract (SW) combined with calcium chloride and boric acid and their combinations in the 2020/2021 and 2021/2022 seasons. The treatments were arranged in a split-plot design (three levels spraying seaweed extract × four levels spraying calcium chloride and boric acid and their combinations × four replicates × one tree/replicate). The results indicated that all of the characteristics measured, including leaf chlorophyll, leaf mineral contents, fruit yield parameters, fruit physical properties, and fruit chemical properties, were significantly affected by the foliar spraying of seaweed extract (SW) combined with calcium chloride and boric acid and their combinations. Although all treatments increased the productivity and the physical and chemical properties of Valencia orange fruits compared to the control, a treatment of 10 g/L SW combined with 0.5 g/L boric acid and 1 g/L calcium chloride produced superior results. This ratio of SW, boric acid, and calcium chloride is therefore recommended to enhance productivity and improve the physico-chemical properties of Valencia orange for greater fruit yield.
许多柑橘属物种和品种在热带和亚热带国家以及有机质含量低和阳离子交换量低的干旱和半干旱地区成功种植，导致植物吸收的养分减少。由于蒸腾速率降低，冬季柑橘开花和坐果所需的必需营养物质有限，对营养生长、开花、产量和果实品质产生负面影响。本研究旨在评估叶面喷施海藻提取物 (SW) 结合氯化钙和硼酸及其组合对瓦伦西亚橙树的营养状况、果实产量参数和果实品质的影响，并在 2020/2021 和 2021/2022 两个季节进行。处理采用裂区设计（三个水平喷施海藻提取物×四个水平喷施氯化钙和硼酸及其组合×四个重复×每棵树/重复）进行安排。结果表明，所有测量的特征，包括叶片叶绿素、叶片矿质含量、果实产量参数、果实物理特性和果实化学特性，均受叶面喷施海藻提取物 (SW) 结合氯化钙和硼酸及其组合的显著影响。虽然与对照相比，所有处理均提高了瓦伦西亚橙的生产力以及果实的物理和化学特性，但 10 g/L SW 与 0.5 g/L 硼酸和 1 g/L 氯化钙组合的处理效果更好。因此，建议使用这种 SW、硼酸和氯化钙的比例来提高生产力并改善瓦伦西亚橙的物理化学性质，以获得更高的果实产量。
