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[Availability Changes in Different Exogenous Selenium Fertilizers in Soil and Their Effects on Selenium Accumulation
Wei Wei1,2, Ping Li1, Zhi-Gao Zhou2
1School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China.
Huan Jing Ke Xue= Huanjing Kexue
|February 12, 2023
Summary
Potassium selenate significantly boosted wheat biomass and selenium accumulation, unlike other tested selenium fertilizers. Different selenium forms varied in soil availability and plant uptake, with selenate favoring leaf accumulation and selenite/EDTA favoring grain accumulation.
Area of Science:
- Agricultural Chemistry
- Plant Nutrition
- Soil Science
Context:
- Understanding the behavior of exogenous selenium fertilizers in agricultural soils is crucial for optimizing crop selenium uptake and improving crop nutritional value.
- Previous research has explored various selenium sources, but comparative studies on their soil availability, plant uptake dynamics, and distribution patterns are limited.
Purpose:
- To investigate the differential availability of common exogenous selenium fertilizers (potassium selenate, potassium selenite, EDTA-chelated selenium, selenium powder, fly ash, and selenium-enriched straw) in soil.
- To evaluate the effects of these fertilizers on wheat growth, selenium uptake, and selenium distribution within plant tissues.
- To establish the correlation between soil available selenium and wheat selenium accumulation.
Summary:
- Potassium selenate, potassium selenite, and EDTA-chelated selenium treatments significantly increased soil available selenium compared to the control. Selenate application notably enhanced wheat grain and leaf biomass.
- Wheat selenium uptake showed a significant positive correlation with soil available selenium content. The accumulation capacity order was selenate > selenite, EDTA-chelated selenium > selenium powder, fly ash, and selenium-enriched straw.
- Selenium distribution varied by fertilizer type: selenate led to greater accumulation in stems and leaves, while selenite and EDTA-chelated selenium favored accumulation in grains.
Impact:
- Provides critical insights into the comparative efficacy of different selenium fertilizers, guiding the selection of optimal sources for enhanced crop selenium content.
- Highlights the importance of considering selenium speciation for targeted accumulation in different plant parts (e.g., grains vs. leaves).
- Informs agricultural practices for selenium biofortification strategies, potentially improving human and animal nutrition through selenium-enriched crops.
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