1. After applying urea on the soil surface, it is important to water it promptly. However, excessive watering or flooding can lead to significant loss of urea due to leaching or volatilization. To minimize this, urea should be applied using methods such as furrow application, banding, or placing it in small holes. The fertilizer should be placed at a depth of 7–10 cm and then covered with soil immediately. It's also essential to ensure even distribution. In summer, water should be replenished after 2–3 days, while in spring and autumn, it's best to wait 6–8 days before rewatering.
2. Applying superphosphate directly to the seed row is not recommended. This is because superphosphate contains 3.5–5% free acid, which is highly corrosive. If applied too close to seeds, especially after long-term storage, it can damage the seeds and reduce germination and emergence rates. Therefore, if superphosphate is used as a seed fertilizer, it should be placed in a separate band or hole within the seed furrow, and separated from the seeds by a layer of soil to prevent direct contact.
3. Applying diammonium phosphate (DAP) with water can lead to nitrogen loss through volatilization and poor phosphorus availability. When DAP is mixed with water, nitrogen tends to evaporate, and phosphorus remains on the soil surface, making it less available to plant roots. As a result, crops may not receive adequate nutrients, reducing the effectiveness of DAP. It is best to apply DAP as a base fertilizer. If used as a top dressing, it should be done early, placed in deep furrows, and covered with soil after application. Typically, the furrow depth should be around 10 cm to enhance nutrient retention.
4. Ammonium bicarbonate should not be applied on the soil surface, as it tends to remain shallow and not mix well with the soil, leading to low nutrient efficiency. To improve its effectiveness, it should be applied deeply into the soil and followed by immediate irrigation. This helps the ammonia to be fully absorbed by the soil particles, reducing losses. Studies have shown that deep application of ammonium bicarbonate can increase its utilization rate by 10–30%, significantly improving crop performance.
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