1、The Effect of Foliar Spraying of Different Selenium Fertilizers on the

This study investigated the effects of four selenium fertilizers (nano-Se, EDTA-chelated Se, organic Se, and microbial Se) at three concentrations (50, 25, and 12.5 mg·L−1) on garlic (Allium sativum L. cv. ‘Xusuan 918’) through foliar application during critical growth stages.

2、Effect of foliar spraying of organic and inorganic selenium fertilizers

The main methods of Se biofortification include soil application of Se and foliar spraying of Se. Soil application results in significant Se wastage since 80–95% of selenate is likely to be lost due to irrigation or rainfall (Keskinen et al. 2011).

3、Foliar Spraying of Nanoselenium Improves the Nutritional Quality of

In this study, different concentrations of nanoselenium were sprayed on the leaves of alfalfa. Compared to the control, nanoselenium (100 mg·L –1) significantly increased SeMet and SeMeCys contents in the roots, stems, and leaves of alfalfa.

4、Foliar spraying of selenium in inorganic and organic forms stimulates

Selenium (Se) treatment stimulates plant growth and secondary metabolism of sage. Organic forms of Se boost photosynthesis, amino acid and carbohydrate metabolism. Inorganic forms of Se intensify carbon flux from primary to secondary metabolism.

5、Effects of Foliar Spraying Selenium on Physiological Characteristics

The results showed that T3 treatment significantly increased the yield of TY16 and JY10, which were increased by 9.91% and 12.51% compared with T0 treatment, respectively, mainly due to the increase of fruit number per plant and fruit number per fruit.

Frontiers

In this study, foliar applications of sodium selenite at concentrations of 0.0075 kg/hm² (FX01) and 0.015 kg/hm² (FX02) were administered during the full heading stage of rice (Oryza sativa L.) to systematically investigate Se uptake, interorgan translocation, and organic Se speciation in grains.

Usage and Dosage of Selenium

Selenium-rich organic fertilizer is a type of organic fertilizer containing a high concentration of selenium. It is primarily used in crop cultivation to enhance disease resistance, improve stress tolerance, promote plant growth, and increase yield.

Effects of foliar selenium spraying on the growth and selenium content

In this study, foliar applications of sodium selenite at concentrations of 0.0075 kg/hm² (FX01) and 0.015 kg/hm² (FX02) were administered during the full heading stage of rice (Oryza sativa L.) to systematically investigate Se uptake, interorgan translocation, and organic Se speciation in grains.

Effects of Foliar

Three foliar-spraying selenium concentrations, such as 0 (S 0), 5 (S 5) and 10 mg·L -1 (S 10), were considered with sodium selenite (Na 2 SeO 3) as the selenium source by using pot experiment in this paper.

Effect of foliar spraying of organic and inorganic selenium fertilizers

Hence, the foliar spraying method could promote the uptake and accumulation of Se in the edible part of plants (Fang et al. 2009). Usually, Se fertilizer is divided into organic Se fertilizer and inorganic Se fertilizer.

Selenium-enriched foliar fertilizer is an effective way to supplement plants with selenium. By applying it directly to leaves, selenium nutrients can be efficiently absorbed, enhancing the selenium content in plants. Below are the recommended spraying methods and dosage guidelines.

I. Preparation Phase

1. Choose the Optimal Timing

• Avoid High Temperatures: High temperatures can reduce absorption efficiency, so apply in the morning or evening.
• Check Soil Moisture: Ensure soil is moist before application to improve adhesion of the fertilizer to leaves.

2. Inspect Fertilizer Composition

• Verify Selenium Content: Check the product label to confirm the selenium concentration meets crop requirements.
• Inspect Packaging: Ensure the package is intact and free of leaks.

3. Prepare Tools and Environment

• Clean Equipment: Use clean sprayers and containers to avoid pesticide residue damage to plants.
• Ventilation: Operate in a well-ventilated area to minimize harmful gas exposure.

II. Application Process

1. Dilution Ratio

• Follow Instructions: Dilute according to the manufacturer’s guidelines.
• Test First: Conduct a small-scale test to observe plant reactions before large-scale application.

2. Uniform Spraying

• Even Coverage: Ensure all leaves are thoroughly coated.
• Avoid Overapplication: Excessive use may cause leaf burn or root damage.

3. Safety Measures

• Protective Gear: Wear masks, gloves, and eye protection.
• Avoid Water Contact: Prevent rain or irrigation immediately after application to avoid dilution.

III. Post-Application Management

1. Monitor Crop Response

• Address Issues Promptly: Watch for signs like yellowing or wilting and take corrective action.
• Document Results: Record application dates and crop reactions for future reference.

2. Soil Management

• Improve Soil Conditions: If selenium deficiency persists, consider soil amendments to boost selenium availability.
• Balanced Fertilization: Coordinate with other fertilizers to avoid nutrient imbalances.

3. Ongoing Monitoring

• Regular Testing: Routinely check soil and crop selenium levels.
• Adjust Strategies: Modify application plans based on testing results to ensure healthy growth.

IV. Key Considerations

1. Avoid Alkaline Mixtures

• Prevent Interactions: Do not mix with alkaline substances (e.g., lime), as they may neutralize the fertilizer.
• Apply Separately: Use alone or in acidic conditions for best results.

2. Environmental Protection

• Minimize Waste: Stick to recommended doses to reduce environmental contamination.
• Proper Disposal: Dispose of leftover solutions according to local environmental regulations.

3. Regulatory Compliance

• Adhere to Laws: Ensure usage complies with regional agricultural regulations.
• Obtain Permits: Seek necessary approvals for specific fertilizers if required.

effective use of selenium-enriched foliar fertilizer requires careful timing, adherence to product guidelines, precise application, safety precautions, and ongoing management. By following these steps, crops can receive optimal selenium supplementation, promoting robust growth and nutritional quality.