Do NH4:NO3 ratio and harvest time affect celery (Apium graveolens) productivity and product quality?

文献类型： 外文期刊

第一作者： Saleh, Said

作者： Saleh, Said;Liu, Guangmin;Liu, Mingchi;Liu, Wei;He, Hongju;Saleh, Said;Abdelhamid, Magdi T.

作者机构：

关键词： growth; nitrate; nutrient solution; quality; time of day; yield

期刊名称：FOLIA HORTICULTURAE （ 影响因子：1.873； 五年影响因子：1.519 ）

ISSN： 0867-1761

年卷期： 2019 年 31 卷 2 期

页码：

收录情况： SCI

摘要： Due to the remarkable health benefits of celery (Apium graveolens), its consumption has increased over time. A partial substitution of NO3- with NH4+ is recommended to limit the accumulation of NO3- in leafy vegetables. Hence, a factorial experiment with two factors, consisting of six treatments as combinations of three NH4:NO3 ratios (0:100, 20:80 and 40:60) in nutrient solutions and two harvesting times (in the morning and in the evening), was conducted on celery plants in a soilless culture system. The results showed that 100% NO3 as a sole N source significantly increased plant height, leaf number, chlorophyll. fresh weight, N, K, Ca, Mg, Fe, Mn, Zn, protein, dietary fibre, soluble sugars, nitrate, vitamin C, alpha-carotene, beta-carotene and lutein of celery plants compared to either 80 or 60% NO3. However, this increase was not significant compared to 20% NH4:80% NO3 in terms of leaf number, fresh yield, N, Mg, Mn. protein, soluble sugars. vitamin C and alpha-carotene. Harvesting in the evening significantly increased K, Mg, Fe, soluble sugars, alpha-carotene and beta-carotene, and lowered the nitrate level in celery plants. In conclusion, partial replacement of 20% NO3-N with 20% NH4-N and evening harvesting are recommended for a greater fresh yield, higher quality, and lower nitrate level.

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