1、Foliar fertilizer spraying technology and issues that need attention

For example, cabbage, spinach, shepherd's purse, etc. require more nitrogen. Spraying fertilizer should be mainly urea and ammonium sulfate. The spraying concentration of urea should be 1~2%, and ammonium sulfate should be 1.5%. Spray 2~4 times per season, preferably in the early growth stage.

2、What concentration is suitable for foliar application of nitrogen

What concentration is suitable for foliar application of nitrogen fertilizers? Generally, a 0.5-1.5% fertilizer solution is recommended.

3、Five important things to consider when doing foliar spraying

Foliar fertilizers should generally be much more concentrated. When people apply foliar fertilization they usually apply much lower concentrations because they are afraid of burning leaves.

Foliar Spraying

Foliar spraying is the most frequently used way of applying pesticides for pest management in trees. However, the limits of spraying are extensive pesticide losses. According to Pimentel (1995), only 0.4% of active substance actually reaches the target pest.

Guide to Foliar Fertilization: Best Practices, Dosages, and Benefits

1. Recommended Foliar Fertilizer Concentrations and Mixing Guidelines Using the correct concentration is critical to avoid leaf damage while ensuring optimal nutrient delivery. The following table outlines commonly used foliar fertilizers, their recommended concentrations, and application tips:

FOLIAR FERT FACT SHEET

The table on the back of this page has been prepared as a guide and a quick reference to application rates and spray concentrations for commonly applied foliar fertilisers.

Foliar Fertilization

When spraying the foliage of plants, a fine mist is preferable to large droplets as greater leaf contact will be made. Remember to spray the undersides of the leaves well. Generally plants are sprayed until droplets start to drip on to the ground.

What is the proper concentration of foliar fertilizer?

The commonly used spraying concentration is 2%~3%; The fertilizer shall be fully stirred after adding water, and shall be filtered after standing for 24 hours. The clear liquid shall be sprayed.

Maximum Allowable Concentrations and Application Methods of NPK

Understanding the maximum allowable concentrations for different blends, such as 10-10-40, 20-20-20, and 10-52-10, and their application methods—foliar, liquid, or drenching—is essential for ...

Foliar Fertilizer Application Technology: Precision Application Guide

This article will comprehensively analyze the core technologies of foliar fertilizer application from basic principles to practical key points, providing scientific guidance for agricultural producers.

Foliar fertilizer spraying is an effective method for supplemental fertilization, capable of rapidly delivering nutrients to plant leaves, enhancing crop growth rates, and increasing yields. selecting the appropriate concentration is crucial to ensuring the efficient use of fertilizers. The following sections provide a detailed guide to choosing the optimal concentration for foliar fertilizer spraying.

I. Understanding the Types of Foliar Fertilizers

First, it is essential to familiarize yourself with the categories of foliar fertilizers. These are primarily divided into water-soluble foliar fertilzers and oil-based foliar fertilizers. Water-soluble fertilizers typically contain multiple nutrients and can be directly dissolved in water for use. In contrast, oil-based fertilizers require mixing with oil before being sprayed onto plant leaves. when selecting a foliar fertilizer, choose a product tailored to the crop type and growth stage.

II. Determining the Concentration of Foliar Fertilizer

1. Water-Soluble Foliar Fertilizers

The concentration of water-soluble foliar fertilizers depends on the product’s recommended dosage and the application purpose. Generally, their concentration ranges from 0.1% to 5%. Specific concentrations should be adjusted based on crop requirements, nutrient composition, and the target spray area. For example:

• Higher concentrations (e.g., for nitrogen supplementation) may be used to address deficiencies.
• Lower concentrations (e.g., for phosphorus supplementation) are often safer to avoid nutrient toxicity. Before large-scale application, conduct small-scale trials to determine the optimal concentration.

2. Oil-Based Foliar Fertilizers

Oil-based fertilizers have more complex formulations, so their concentrations are typically narrower, ranging from 0.1% to 0.3%. Always follow the manufacturer’s instructions or consult professionals to determine the appropriate dilution. Additionally, test on non-target crops first to ensure no adverse effects on the intended plants.

III. Consider Crop Requirements

Different crops have varying nutritional needs. For example:

• Grain crops (e.g., rice, wheat) often require higher nitrogen levels and may tolerate higher-concentration water-soluble fertilizers.
• Leguminous crops (e.g., soybeans) benefit more from phosphorus and may require lower-concentration solutions. For micronutrients like iron (Fe) or zinc (Zn), foliar spraying is effective, but avoid overapplication to prevent toxicity.

IV. Account for Environmental Factors

Environmental conditions, such as temperature and humidity, significantly impact spraying efficacy:

• Temperature: Higher temperatures improve nutrient absorption, but avoid spraying during extreme heat to prevent leaf burn.
• Humidity: Higher humidity aids fertilizer adhesion and absorption, though excessive moisture may dilute the solution too quickly. Adjust spraying schedules and frequency based on weather conditions for optimal results.

V. Follow Safety Protocols

When applying foliar fertilizers, adhere to safety practices:

• Avoid spraying under intense sunlight to reduce leaf damage.
• Use dedicated sprayers and containers to prevent contamination of water sources.
• Wash hands thoroughly before and after application to avoid skin or eye contact.
• Ensure proper ventilation indoors to minimize inhalation of fumes.

selecting the appropriate concentration for foliar fertilizer spraying requires综合考虑 multiple factors, including fertilizer type, crop needs, environmental conditions, and safety guidelines. By balancing these elements, farmers can maximize fertilizer efficiency and promote healthy crop growth.