Improper use of fertilizers in greenhouse vegetables can lead to several serious issues. It not only causes soil compaction but also results in fertilizer damage to the vegetables. Additionally, excessive nitrate and nitrite levels in the vegetables may exceed safety standards, posing a risk to human health. Therefore, it is essential to apply chemical fertilizers carefully and implement scientific fertilization methods when growing vegetables in greenhouses.
1. **Decompose Farmyard Manure**: When applying farmyard manure to greenhouse vegetables, it must be fully decomposed. Undecomposed manure can carry pathogens and eggs that may spread diseases. Moreover, if the manure is placed directly into the greenhouse and then decomposes, it can produce ammonia, which may burn young plants.
2. **Use Scientific Fertilization Methods**: Base fertilizers should be applied about a week before planting and mixed thoroughly with the soil. Topdressing should be done by placing the fertilizer in a ditch or hole at least 7–10 cm away from the plant. After topdressing, cover the soil and water it promptly. Avoid spreading fertilizer directly on the ground or on the plants to prevent volatilization and potential burning of seedlings. Apply topdressing during the peak growth phase and later stages of vegetable development, preferably on cloudy days or in the evening. Spray the fertilizer on the back of new leaves for better absorption.
3. **Apply Fertilizers in Appropriate Amounts**: Greenhouse soils do not easily lose nutrients, so overuse of chemical fertilizers can increase salt concentration and cause soil salinization. Limit the use of ammonium-based fertilizers and increase phosphorus and potassium application. Avoid using nitrate nitrogen fertilizers like ammonium nitrate or potassium nitrate. Enhance ventilation and light intensity to reduce nitrate content in vegetables. Do not use chlorinated fertilizers such as potassium chloride or ammonium chloride, as they can reduce starch content and affect quality. Limit the use of magnesium sulfate and iron sulfate, as their sulfate ions are not easily absorbed and can harm plant growth. Also, use ammonium bicarbonate sparingly due to its tendency to release ammonia gas, which can cause ammonia damage.
4. **Use Micro-Fertilizers Appropriately**: Although micro-fertilizers are needed in small amounts, they play a crucial role in improving vegetable quality. Common types include boron, zinc, and iron fertilizers. These can be used as base fertilizers, seed treatments, or foliar sprays. The dosage must be precise, as even slight excess can be harmful. Plant growth regulators like gibberellin or paclobutrazol can boost production, but their application must be carefully managed in terms of timing and concentration to avoid negative effects on both yield and human health.
5. **Promote Bio-Organic Compound Fertilizers**: These fertilizers contain beneficial microbes and combine organic, inorganic, bacterial, and synergistic components. They offer a balanced and scientifically formulated approach to fertilization, making them an ideal choice for greenhouse vegetables.
6. **Use Vegetable-Specific Fertilizers**: Under the guidance of formula fertilization, vegetable-specific compound fertilizers are recommended. These are tailored to the nutrient needs of different crops and soil conditions, offering more complete and scientifically balanced nutrition. Their targeted formulation significantly improves both yield and quality of greenhouse vegetables.
For more information on innovative fertilizers, visit [China's New Fertilizer Network](http://). Follow us on WeChat: **cnfert**.
Control Valve,Electric Temperature Regulating Valve,Electric Temperature Control Valve
Chongqing Xingjida Import and Export Trade Co., Ltd. , https://www.xjdvalve.com