Reza Rezvani; Behnam Kamkar; Zeinab Jabbari Badkhor
Abstract
To mitigate the detrimental effects of salinity stress on vegetable crops, various approaches, including the applying of organic inputs during different growth stages, such as germination, are employed. This study, conducted in 2023, aimed to assess the influence of humic acid pretreatment on the germination ...
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To mitigate the detrimental effects of salinity stress on vegetable crops, various approaches, including the applying of organic inputs during different growth stages, such as germination, are employed. This study, conducted in 2023, aimed to assess the influence of humic acid pretreatment on the germination characteristics and growth parameters of cucumber (Cucumis sativus) under salt stress. Two experiments, one in the laboratory and the other in a greenhouse, were carried out using a factorial design based on a completely randomized design with three replications. The experimental factors included humic acid priming at four concentrations (0, 50, 100, and 200 mg/l-1) and salinity at five levels (0, 25, 50, 100, and 150 mM NaCl). Results indicated that humic acid exerted a positive impact on various germination and growth attributes of cucumber, including germination percentage, germination rate, seedling length, dry weight, vigor index, and chlorophyll a, b, and carotenoid under salt-stressed conditions compared to the control. The treatment with 200 mmol/l humic acid and no salt exhibited the highest germination rate (87%) and seedling length (12.66 cm). The interaction between salinity and humic acid revealed that humic acid concentrations exceeding 100 mg/l-1 could alleviate the adverse effects of salinity stress on total chlorophyll. In conclusion, the cost-effective and easily applicable method of priming cucumber seeds with humic acid presents a potential strategy to mitigate the impacts of salinity stress in regions with saline water or soil.
H. Gholami; M. Parsa; M. Khajeh-Hosseini; H.R. Khazaie
Abstract
In order to determine the effects of the foliar applicationof ureaand micro elements during growth periods of maternal plants on germination, vigor and greening of produced chickpea seeds (Kabuli), an experiment was carried out in a randomized complete block design with 12 treatments and three replications ...
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In order to determine the effects of the foliar applicationof ureaand micro elements during growth periods of maternal plants on germination, vigor and greening of produced chickpea seeds (Kabuli), an experiment was carried out in a randomized complete block design with 12 treatments and three replications at the Agricultural Faculty Research Station, Ferdowsi university of Mashhad during 2013-2014. The treatments consisted of foliar applicationat six levels: control (foliar application with water); foliar applicationof urea (2 %); foliar applicationof urea + (2%) Zinc (2 per thousand); foliar applicationof urea (2%) + Iron sulfate (3 per thousand); foliar applicationof urea (2%) + Zinc (2 per thousand) and iron (3 per thousand); foliar applicationwith urea+ complete fertilizer (3 per thousand micro-elements containing 500 ppm) and foliar applicationwith two levels, sprayed once at the beginning of flowering and sprayed twice namely, one at the beginning of flowering and one at seeding stage that include 12 treatments in total. The result showed that foliar application was not significant on germination percentage and maximum speed of germination using two times foliar application of urea + Zinc+ iron and foliar applicationwith urea+ complete fertilizer in flowering and seeding time treatments, respectively. Two times offoliar application using urea + zinc + iron had the highest impact on the vigor index.
