Foliar Fertilization by the Sol-Gel Particles Containing Cu and Zn

Area of Science:

• Agricultural Science
• Materials Science
• Plant Nutrition

Background:

• Conventional fertilizers can face challenges in plant uptake and bioavailability.
• Nanoparticle-based fertilizers offer potential for improved nutrient delivery and reduced environmental impact.
• The sol-gel method allows for controlled synthesis of silica nanoparticles with specific ion incorporation.

Purpose of the Study:

• To synthesize and evaluate silica nanoparticles (150-200 nm) loaded with Ca, P, Cu, or Zn ions as foliar fertilizers.
• To compare the efficacy of these engineered nanoparticles against conventional CuSO4 and ZnSO4 solutions.
• To assess the impact of these nanoparticles on plant growth and metal uptake in maize, wheat, and rape under different soil conditions.

Main Methods:

• Sol-gel synthesis of silica nanoparticles incorporating Ca, P, Cu, or Zn ions.
• Foliar application of nanoparticle suspensions and conventional salt solutions to maize, wheat, and rape.
• Plant harvesting at a specific BBCH (Biologische Bundesanstalt, Bundessortenamt und CHemische Industrie) stage.
• Determination of Cu and Zn content using Atomic Absorption Spectroscopy (AAS).

Main Results:

• Copper-containing silica nanoparticles enhanced copper supply to plants more effectively than CuSO4 in many instances.
• Zinc-containing nanoparticles exhibited a limited effect on plant growth and zinc concentration.
• All tested silica nanoparticles demonstrated no toxicity, though some caused minor growth reductions.

Conclusions:

• Silica nanoparticles show potential as effective carriers for delivering copper foliar fertilizers.
• Further research is needed to optimize zinc-containing nanoparticles for improved plant uptake.
• Engineered silica nanoparticles represent a safe and potentially more efficient alternative for plant micronutrient supplementation.