Liquid nitrogen fertilizer is a commonly used nutrient supplement for plants, containing a high concentration of nitrogen that can be rapidly absorbed and utilized by plants to promote growth. the use of liquid nitrogen fertilizer is not the more, the better, nor is it the more frequent, the better. Regarding the frequency and timing of liquid nitrogen fertilizer application, here are some recommendations:

1. Timing of Application: Generally, liquid nitrogen fertilizer works best when applied during the plant's vigorous growth period. This is because plants have higher nutrient demands during this phase, and foliar spraying can quickly replenish the required nutrients, accelerating growth. Additionally, the vigorous growth period is critical for pest and disease control, as applying liquid nitrogen fertilizer can help prevent certain issues. it is recommended to apply during this phase.

2. Time of Application: The timing of liquid nitrogen fertilizer application should be determined based on the plant's growth stage and weather conditions. Generally, applying in the morning or evening yields better results, as lower temperatures during these periods aid nutrient absorption and assimilation. In hot weather, avoid midday application, as high temperatures can cause leaf scorching.

3. Concentration: The application concentration of liquid nitrogen fertilizer depends on the plant species and soil conditions. For most plants, a concentration of 100–200 mg/L is sufficient. In poor soils, increase the concentration slightly; in fertile soils, reduce it. Observe plant responses and adjust concentrations as needed.

4. Dosage: The amount of liquid nitrogen fertilizer should be tailored to actual needs. Typically, 5–10 kg per mu (0.067 hectare) is adequate for most crops. Excessive use wastes resources and may harm soil health, leading to compaction or salinization. Follow the principle of moderation to avoid overapplication.

5. Application Methods: There are two main methods: foliar spraying (directly onto leaves, suitable for seedlings and vigorous growth stages) and soil application (mixing with soil, suitable for mature plants or high-nutrient needs). Choose the method based on the plant’s stage and type.

6. Precautions:

   • Avoid mixing with other fertilizers to prevent chemical reactions and nutrient loss.
   • Monitor plant responses; discontinue use and consult experts if adverse effects occur.
   • Prioritize environmental protection by minimizing chemical use and advocating for green agricultural practices.

the application of liquid nitrogen fertilizer should align with the plant’s growth stage and weather conditions. Adjust timing, concentration, dosage, and methods as needed. Emphasize sustainable practices to reduce environmental impact and promote eco-friendly agriculture.