نوع مقاله : مقاله کامل علمی پژوهشی
نویسندگان
1 دانشجوی دکتری گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران.
2 دانشیار گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران
3 استاد گروه علوم و مهندسی خاک، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران
4 استاد گروه مهندسی تولید و ژنتیک گیاهی، دانشکده کشاورزی، دانشگاه شهید چمران اهواز، اهواز، ایران
5 استادیار گروه شیمی، دانشکده علوم، دانشگاه شهید چمران اهواز، اهواز، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Effect of zinc aminochelate and ZnSO4 on zinc speciation in soil and its concentration in sunflower
Abstract
Background and objectives: Zinc (Zn) is an essential micronutrient for various physiological and biochemical processes in plants. Zn deficiency affects plant growth and development and reduces plant yield and nutritional quality. In calcareous soils, Zn aminocholate is one of the novel fertilization strategies to address Zn deficiency for plant. This study was conducted to determine Zn speciation in soil solution and predict Zn chemical species and their correlation with Zn concentration in sunflower. Zinc (Zn) is an essential micronutrient for various physiological and biochemical processes in plants. Zn deficiency affects plant growth and development and reduces plant yield and nutritional quality. In calcareous soils, Zn aminocholate is one of the novel fertilization strategies to address Zn deficiency for plant. This study was conducted to determine Zn speciation in soil solution and predict Zn chemical species and their correlation with Zn concentration in sunflower.
Materials and methods: This experiment was conducted in a completely randomized design with three replications in field conditions. The experimental treatments included fertigation of Zn-glycine [Zn (Gly)2] and Zn- methionine [Zn (Met)2] aminocholates (4 L-1) and ZnSO4 fertilizer (40 kg ha-1) and control treatment (without fertilizer). After the cultivation period, soil chemical properties including pH, available Zn, dissolved organic carbon (DOC), soluble cations and anions, soil soluble Zn, and Zn concentration in leaf and seed of sunflower were measured. Visual MINTEQ geochemical software was used to predict the dominant Zn species in the soil solution phase.
Results: The results showed that soil pH, soil soluble Zn, and DOC were affected by treatments. Zn aminochelates significantly reduced soil pH. Also, these aminochelates significantly increased DOC, soil soluble Zn, and Zn concentration in sunflower leaves and seeds compared to the control treatment. The highest amount of Zn bound to dissolved organic matter (Zn-DOM) species was obtained by the application of the [Zn (Met)2] aminochelate treatment. Zn aminochelates and ZnSO4 fertilizer also significantly increased the concentration of free Zn specie (Zn2+) compared to the control treatment. The results also indicated a significant positive correlation between Zn2+ and Zn-DOM species with Zn concentration in plant leaves and seeds.
Conclusion: The results of this study demonstrated that the application of Zn aminochelates can be considered as an effective approach to improve soil conditions, increase Zn availability and improve the nutritional quality of sunflower plants under Zn deficiency conditions.
Keywords: Aminochelate; Chemical fertilizer; Dissolved organic carbon; Soluble Zn; Sunflower
کلیدواژهها [English]
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