Urea is the solid nitrogen fertilizer with the highest concentration produced in China, and its aqueous solution is neutral. It is widely used as a base fertilizer for crops, but most of it is applied as top-dressing to enhance yield and growth. To maximize the effectiveness of urea fertilizer, the following practices are recommended:
1. **Apply Based on Soil Fertility**
Field experience has shown that increasing urea application in low and medium productivity fields can significantly boost crop yields. In high-yield areas, maintaining standard fertilization levels is usually sufficient. For example, in high-fertility soils, apply 20 kg per mu as top-dressing for corn or sorghum. In medium fertility soils, increase to 23 kg per mu, and in low-yield soils, use 27 kg per mu.
2. **Time Application During Peak Nutrient Uptake**
The main purpose of top-dressing is to supply nutrients when crops need them most, especially during their mid- to late-growth stages. The key is to apply urea during the critical nutrient absorption periods of each crop. For instance, corn should be top-dressed during the jointing to the booting stage, while sorghum benefits from application between the jointing and booting stages. Rice should be treated during the tillering stage, sunflowers during budding, wheat during the three-leaf stage, and soybeans during early flowering.
3. **Incorporate Deeply into the Soil**
When urea is left on the surface, a significant portion of nitrogen can be lost through volatilization, especially on calcareous or alkaline soils. To reduce this loss, it's best to apply urea by digging small pits or placing it beneath the soil surface (no more than 10 cm deep). This helps retain moisture, promotes conversion of urea into usable forms, and reduces ammonia loss. For rice, keep the water layer shallow—no more than 3–5 cm after top-dressing.
4. **Avoid Direct Contact with Plants**
Urea has a high nitrogen content and strong hygroscopic properties, which can cause leaf burn if applied too close to plant roots or directly into the center of the plant. Therefore, maintain a safe distance when applying urea to avoid damaging young plants and ensure even nutrient distribution.
5. **Apply Earlier Than Other Nitrogen Fertilizers**
Urea requires a conversion process in the soil before it becomes available to plant roots. This process takes time, so it’s advisable to apply urea about seven days earlier than other nitrogen-based fertilizers to allow proper breakdown and absorption.
6. **Avoid Mixing with Alkaline Fertilizers**
Urea is a neutral fertilizer and should not be mixed with alkaline materials, as this can reduce its efficiency. If mixing is unavoidable, stagger applications by 3–5 days. However, combining urea with potassium chloride, phosphate rock, or superphosphate can actually enhance crop performance.
7. **Avoid Immediate Irrigation After Application**
Urea needs time to convert into a form that plants can absorb. Watering immediately after top-dressing can lead to significant losses. Instead, use light irrigation and avoid flooding. For rice, wait at least 3–5 days before watering again to allow urea to break down properly.
8. **Use for Foliar Spraying When Appropriate**
Urea is highly soluble and easily absorbed through leaves, making it ideal for foliar feeding. It causes less leaf damage compared to other fertilizers. Use urea with a biuret content below 2% to prevent leaf burn. The concentration varies by crop: 1.5%–2% for monocots and 1% for dicots. Apply 0.5–1.5 kg per mu, preferably in the late afternoon when evaporation is low, allowing better absorption overnight.
By following these guidelines, farmers can maximize the efficiency and effectiveness of urea fertilizer, leading to better crop yields and sustainable agricultural practices.
LED Flood Light
The classification mainly includes the aluminum or zinc alloy die casting Machinery Parts using in LED Flood Light area.
In the die casting process,higher specific pressure is required,so that higher filling speed can be obtained.which is beneficial for alloy to overcome mold filling resistance.and effectively fill each part of the cavity.The Casting General Tolerance is Grade GB-CT4.
Process Technology: High pressure die casting,Shot Blasting,NC Machining,Spray Coating
Product Dimensions: Customized
Casting General Tolerance: Grade GB-CT4
Flow Processes: Die casting,Degating,Polishing and Deburring to remove the burrs,Polishing to remove the parting line,flash,CNC Turning, Cleaning, Packaging, Storaging, Shipping
Control Measure: Incoming Material Test, First Article inspection,Routing inspection,Final item inspection, and Outgoing quality control
Inspection Equipment: CMM, Caliper,Plug Gage,Screw Gauge
Application: Lighting Parts
Certificate: IATF16949:2016,ISO14001:2015,ISO45001:2018
Lead Time: 30-35 days
Trade Term: FOB Ningbo
Alumimum Casting LED Flood Light Parts,Die Casting Parts for LED Flood Light,Zinc Die Casting LED Flood Light Parts
NINGBO ZHENHAI BOLANG METAL PRODUCTS FACTORY , https://www.casting-part.com
