1、Thinking about using foliar fertilizers in soybeans?

This article will focus on the question of whether using foliar-applied fertilizer products in soybeans can increase yield and profitability. Crops like soybeans obtain the bulk of their nutrients by extracting them from the soil as they take up water.

2、Which Foliar Fertilizers Are Effective During Soybean's Early Flowering

Optimizing foliar fertilizer selection during soybean’s early flowering stage requires considering growth status, soil conditions, and proper application techniques.

3、Foliar Fertilizers Rarely Increase Yield in US Soybean

Soybean farmers are interested in foliar products that apply a mixture of micronutrients and macronutrients and can be tank-mixed with insecticides and fungicides and applied during early reproductive growth (R1-R4).

4、Foliar fertilizers rarely increase yield in United States soybean

Products were selected with the input of industry professionals to identify foliar fertilizers that are nationally marketed to soybean producers. Products were applied at soybean growth stage R3 to align with commonly used fungicide and insecticide application timing.

How to Fertilize Soybeans in Late Growth Stages

Learn how to fertilize soybeans during flowering, pod setting, and grain filling stages. Discover how Soybean Late Stage Specialty Fertilizer enhances pod retention, photosynthesis, oil and protein accumulation, and final yield.

The Benefits of Soybean Foliar Fertilizer Application

Nutrients such as potassium and manganese, however, are utilized by soybeans at many growth stages so the plant can benefit from a foliar treatment of those nutrients across a wider application window. Ideally, foliar nutrition should be a component of a complete crop nutrition program.

Foliar fertilization of soybean: Is it useful to supplement primary

Many Iowa fields require phosphorus (P) and potassium (K) fertilization for optimum soybean production. Suggested application rates, when required and based on soil testing, are fairly large amounts.

Soybean fertilizer guidelines

Foliar application of nitrogen during the growing season can decrease yields. In-season application of fertilizer-N is not recommended for soybean production in Minnesota. Nitrogen fertilizer use for soybean production in the Red River Valley deserves special consideration.

Results of Foliar Fertilizer Application in Soybean

The conclusion: foliar fertilizer products, similar to those tested, are not recommended for use by North Dakota soybean producers in the absence of symptoms of nutrient deficiency. This research was conducted a part of the “Science for Success” project funded by the soybean checkoff.

Growing Soybean

Everything you need to know about soybean fertilization, best practice, suitable products, field trials and more.

Soybean, as one of the world's most important oil crops, plays a critical role in ensuring national food security and increasing farmers' income. Foliar fertilization during its growth stages is a key measure to enhance yield, improve quality, and boost stress resistance. Below is a detailed guide on the types of foliar fertilizers suitable for soybean and their application methods:

I. Selection of Foliar Fertilizers for Soybean

1. Nitrogen Fertilizers

• Urea: A common nitrogen source, urea rapidly provides essential nitrogen for plant growth. It promotes leaf expansion and stem thickening, fostering robust plant development. excessive use may lead to excessive vegetative growth, reducing yields. Precise dosage control is crucial.
• Potassium Nitrate: Contains nitrogen, phosphorus, and potassium, offering comprehensive nutrition. It strengthens root systems, enhances nutrient uptake, and improves disease resistance and stress tolerance, thereby boosting yield and quality.
• Potassium Dihydrogen Phosphate: Rich in phosphorus and potassium, this fertilizer stimulates photosynthesis, increases sugar and nutrient content in leaves, and enhances cold and drought resistance, reducing disease risk.

2. Micronutrient Fertilizers

• Borax (Boric Acid): Promotes root development and nutrient absorption. It stabilizes flower bud differentiation, improving flowering consistency and yield.
• Zinc Sulfate: Stimulates leaf growth and disease resistance. By optimizing photosynthetic efficiency, it increases soybean productivity.
• Copper Sulfate: Enhances root growth and nutrient uptake while suppressing diseases, reducing their impact on plants.

3. Organic Fertilizers

• Well-Decomposed Chicken Manure: Rich in organic matter and microelements, it provides balanced nutrition, improves soil structure, and boosts microbial activity, benefiting soybean growth.
• Bio-Bacterial Fertilizers: Contain beneficial microorganisms that promote root development, enhance nutrient absorption, and improve soil fertility and water retention.
• Organic Matter (e.g., Animal Manure, Crop Straw): Supplies essential nutrients and organic matter, enriches soil microbial communities, and enhances soil health.

II. Methods for Foliar Fertilization

1. Dilution Ratios

• Urea: Dissolve 0.5 grams of urea per liter of water to avoid leaf scorch.
• Potassium Nitrate/Phosphate: Use 1–2 kg per mu (~0.066 ha) per application. Ensure even dilution to prevent burning young shoots.

2. Spray Timing

• Morning or Evening: Apply during peak plant activity (cooler temperatures) to maximize absorption and minimize evaporation.
• Calm Conditions: Choose windless or low-wind days to reduce drift and improve coverage.

3. Spray Techniques

• Uniform Coverage: Use a fine mist to coat all leaf surfaces evenly.
• Moderate Application: Adjust volume based on fertilizer type and plant stage. Avoid over-application to prevent excess growth.
• Avoid Leaf Pooling: Rinse leaves with clean water after spraying to prevent fungal diseases.

III. Post-Fertilization Management

1. Monitor Plant Response

• Growth Vigor: Track leaf color, size, and quantity to assess fertilizer effectiveness. Adjust strategies if abnormalities arise (e.g., stunted growth).
• Disease/Pest Alerts: Inspect for signs of infection or infestation. Promptly address issues by refining fertilization or improving environmental conditions.

2. Water Management

• Irrigation: Follow fertilization with timely watering to aid nutrient absorption. Maintain soil moisture without waterlogging.
• Drainage: Ensure proper drainage to prevent root rot and fungal outbreaks.

3. Disease and Pest Control

• Preventive Measures: Strengthen plant immunity through balanced fertilization, soil health, and sanitation practices.
• Timely Intervention: Use biopesticides, manual removal, or targeted chemicals to manage outbreaks. Maintain ventilation and irrigation discipline to support recovery.

Tailor foliar fertilization to soybean’s specific growth stages and nutritional needs. Scientific management not only boosts yield and quality but also enhances stress resilience. Observe plant responses and environmental changes to refine strategies and optimize outcomes.