Okba Sameh K, Mazrou Yasser, Elmenofy Hayam M, Ezzat Ahmed, Salama Abdel-Moety
Deciduous Fruit Department, Horticulture Research Institute, Agricultural Research Center, Giza 12619, Egypt.
Community College, King Khalid University, Abha 62217, Saudi Arabia.
Plants (Basel). 2021 Jun 8;10(6):1163. doi: 10.3390/plants10061163.
This is the first report to study the impacts of potassium sources on apricot fruit yield, quality and storability as a preharvest foliar application. Five sources of potassium (K-humate, K-sulphate, K-nitrate, K-silicate and K-citrate), plus water as a control treatment, were applied individually at 0.2% three times on 'Canino' apricot over the 2019 and 2020 seasons. The results showed that all potassium salts, applied foliarly, have potential to improve yield, fruit color, and some fruit physical attributes, such as: weight, size and firmness, as well as a reduced lipid peroxidation, accompanied by a low fruit malondialdehyde content reflected in a high tolerance during storage. The K-nitrate treatment was more effective in the improvement of fruit yield, preharvest quality parameters and keeping fruit postharvest quality characteristics from sharp decline during cold storage. Concerning fruit anatomy, K-nitrate and K-citrate showed thicker cuticle and epidermal parenchyma cell diameters, while the K-silicate induced the highest cell wall thickness. K-nitrate was the most economical, and could be recommended for apricot growers in the Nubaria region of Egypt.
这是首份研究钾源作为采前叶面喷施对杏果实产量、品质及耐贮性影响的报告。在2019年和2020年生长季，对‘卡尼诺’杏单独施用5种钾源（腐殖酸钾、硫酸钾、硝酸钾、硅酸钾和柠檬酸钾），浓度均为0.2%，各喷施3次，另设水处理作为对照。结果表明，所有叶面喷施的钾盐均有提高产量、改善果实色泽及一些果实物理特性（如重量、大小和硬度）的潜力，同时还能降低脂质过氧化，果实丙二醛含量较低，表明贮藏期间耐受性较高。硝酸钾处理在提高果实产量、采前品质参数以及保持果实采后品质特性、防止冷藏期间急剧下降方面效果更佳。在果实解剖学方面，硝酸钾和柠檬酸钾处理的果实角质层和表皮薄壁细胞直径更厚，而硅酸钾处理诱导细胞壁厚度最大。硝酸钾最为经济，推荐给埃及努巴里亚地区的杏农使用。
