During the seedling stage, if the soil in the seedbed lacks sufficient nutrients, the seedlings may show signs of nutrient deficiency, such as thin stems, small leaves, and pale color. In such cases, it's important to apply a top dressing promptly. Here are the specific guidelines and best practices:
The ideal time for top dressing is when the seedlings have fully emerged and their cotyledons are flat. It’s best to perform this task during the middle of the day on a sunny day, preferably between 10 a.m. and 2 p.m., to ensure maximum absorption.
For fertilization, both chemical and organic fertilizers can be used as top dressings. When using chemical fertilizer, nitrogen-based products are preferable, and compound fertilizers are recommended. The fertilizer should be dissolved in water before application. The typical ratio is 0.1 to 0.3 grams of fertilizer per 100 liters of water. If the concentration exceeds 0.5%, it could lead to root burn. After applying the fertilizer, it's essential to water the plants again to rinse off any fertilizer that may stick to the leaves, preventing leaf damage. Proper ventilation is also crucial to avoid the buildup of harmful gases like ammonia or hydrogen sulfide.
If organic fertilizer is used, it should first be diluted with water at a ratio of 10:1 to 20:1 before being applied to the seedbed. Regardless of the type of fertilizer used, it's important to spray the plants with water after application to prevent leaf burn and ensure even distribution of nutrients.
In situations where the seedbed temperature is low and the roots are not yet strong enough to absorb nutrients effectively, it's better to avoid root feeding. Instead, you can spray the foliage with a solution of 0.1% potassium dihydrogen phosphate, 0.3% urea, or a 0.2-0.3% calcium superphosphate leachate. These foliar sprays provide quick nutrient uptake and support healthy growth without overloading the root system.
By following these steps, you can ensure that your seedlings receive the necessary nutrients at the right time, promoting strong and vigorous growth. Always monitor the condition of your plants and adjust your fertilization strategy accordingly for the best results.
U-Bolt, namely horseback bolt. It is a non-standard part. It is named because of its U-shape. It has threads at both ends and can be combined with nuts. It is mainly used to fix tubular objects such as water pipes or sheet objects such as car leaf springs. Because it fixes objects in the same way as people ride on a horse, it is called horseback bolt.
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