Slow Release DAP

Leveraging advanced gelatin/PVA composite coating technology developed at our own manufacturing facility, our Slow Release DAP precisely regulates the nutrient release cycle (ranging from 30 to 120 days). This innovation effectively addresses the critical shortcomings associated with traditional DAP—such as low nutrient utilization rates, severe nutrient loss, and the need for frequent top-dressing—making it suitable for a wide variety of crops and soil types. As a reliable supplier, we meet the procurement needs of global agricultural distributors, large-scale farming bases, and individual farmers through rigorous quality control, ample inventory, competitive pricing, and comprehensive after-sales support.

Key Product Advantages

1. Slow-Release & Long-Lasting

Saves Labor and Reduces Costs: Our Slow Release DAP utilizes a gelatin/PVA composite coating technology to form a breathable protective film on the surface of each granule. Once soil moisture permeates the coating, nutrients dissolve slowly and diffuse at a steady rate through microscopic pores. With a customizable release cycle of 30 to 120 days, the nutrient supply is precisely synchronized with the crop's growth rhythm. This reduces the frequency of top-dressing applications from the typical 2–3 times down to just once, resulting in significant savings on labor costs.

2. High Nutrient Content & Utilization Rate

Minimizes Waste: The product features a total nutrient content of ≥64% (comprising ≥18% Total Nitrogen and ≥46% Effective Phosphorus), characterized by high purity and minimal impurities. The coating-based nutrient-locking technology minimizes nutrient leaching and volatilization, boosting nutrient utilization efficiency to over 60%. Consequently, growers can achieve the same level of fertilization efficacy while reducing application rates by 20%–30%, thereby lowering overall cultivation costs.

3. Broad Adaptability & High Safety Profile

Its mildly alkaline nature makes it suitable for use in neutral, acidic, and slightly alkaline soils. With a moisture content of ≤2.0%, the product resists caking during storage and transport. The granules are uniform in size and possess excellent flowability, allowing for versatile application methods—including broadcasting, furrow application, and mechanized spreading. It is ideally suited for a wide range of cultivation scenarios, including wheat, corn, rice, fruits, vegetables, and various cash crops.

Advanced Production Technology

AOLANSU Slow Release DAP is manufactured at Shandong AOLANSU’s own standardized facility, which is equipped with specialized coating production lines and environmental protection systems:

1. Raw Material Selection

We utilize high-purity phosphoric acid and liquid ammonia as raw materials, ensuring nutrient purity and stability right from the source.

2. Coating Process

We employ a proprietary gelatin/PVA composite coating technology. This creates a uniform, semi-permeable membrane layer that allows for controlled nutrient release, eliminating the risk of "burst release" and ensuring a stable, consistent release cycle.

3. Environmental Compliance

Our production process adheres to strict environmental standards, generating no harmful emissions. The final product complies with the GB 10205-2009 National Standard as well as international standards for slow-release fertilizers.

Rigorous Quality Control

We implement a comprehensive, end-to-end quality control system—spanning from raw material intake and processing to the packaging of the finished product. Every batch of AOLANSU Slow Release DAP undergoes multiple rigorous tests:

1. Nutrient Content Analysis: We verify that nitrogen and phosphorus levels meet established standards, ensuring absolute consistency across all batches.

2. Coating Integrity Testing: We strictly monitor the thickness and uniformity of the coating layer to guarantee stable and effective slow-release performance.

3. Physical Property Testing: We ensure the granules have a diameter of 2–4 mm and moderate hardness; they are free of clumps and dust, making them ideally suited for mechanized fertilizer application.

Real-World Application Case Study

Case: Rice Cultivation in Southeast Asia (2024, Chao Phraya River Plain, Thailand)

1. Cultivation Scenario: A contiguous 1,000-mu (approx. 67-hectare) rice field with acidic soil. Under traditional fertilization methods, three separate applications were required: a basal fertilizer, a tillering fertilizer, and a panicle fertilizer.

2. Application Strategy: 20 kg of AOLANSU Slow Release DAP was applied per mu. This was applied as a single, deep-placement basal fertilizer application, with no subsequent top-dressing required during the entire growth cycle.

3. Measured Results:

3.1 Sustained Nutrient Supply: Nutrient availability remained stable throughout the tillering and grain-filling stages, resulting in lush green foliage and preventing premature senescence (aging) of the plants.

3.2 Yield Increase: The yield per mu rose from 480 kg to 560 kg—an increase of 16.7%.

3.3 Cost Reduction: By eliminating two top-dressing applications, labor costs were reduced by 80 RMB per mu, while overall fertilizer consumption was reduced by 25%.

Product Specifications 

FAQ

Q1: What is the difference between Slow Release DAP and ordinary DAP?

A1: The biggest difference lies in the slow-release performance. Our Slow Release DAP adopts gelatin/PVA composite coating technology, which can realize slow and continuous release of nutrients, with a slow-release period of 30-120 days, reducing topdressing times and improving nutrient utilization rate. Ordinary DAP releases nutrients quickly, which is easy to cause nutrient loss and requires frequent topdressing. Shandong Aolansu’s factory has carried out a lot of field tests to verify the advantages of slow release DAP in practical application.

Q2: What crops is Slow Release DAP suitable for?

A2: It has strong versatility and is suitable for almost all crops, including food crops such as rice, wheat and corn, cash crops such as cotton, oilseeds and vegetables, and fruit trees such as apples, pears and citrus. It is especially suitable for large-scale planting bases and areas with inconvenient topdressing, which can greatly save labor costs.

Q3: Why choose Shandong Aolansu as your China supplier for Slow Release DAP?

A3: We are a professional China manufacturer with our own factory, focusing on Slow Release DAP production for many years. We have advanced coating production lines and strict quality control system, ensuring stable product quality and reliable slow-release effect. We provide factory-direct prices, sufficient stock, timely delivery and complete export documents, which can fully meet your bulk procurement needs.

Q4: How to store Slow Release DAP correctly?

A4: It should be stored in a dry, ventilated and cool warehouse, away from moisture and alkaline substances, to avoid caking and affecting the slow-release effect. It should not be stored in a humid and high-temperature environment, and should be stacked neatly to prevent extrusion and damage of the coating. Our factory will attach detailed storage guidelines to each batch of goods to help you store them correctly.

Service and Delivery

1. Flexible Orders: We support small-batch trial orders starting from just 1 ton, thereby minimizing procurement risks. With ample stock maintained year-round, we are able to facilitate rapid bulk shipments.

2. Export Support: We provide a comprehensive suite of export documentation—including MSDS, COAs, and Certificates of Origin—to ensure smooth customs clearance in regions such as Southeast Asia, Africa, and South America.

3. Professional Assistance: We offer free samples (ranging from 500g to 1kg) to facilitate field testing. Our agricultural technical team provides customized fertilization plans and expert post-sales guidance.

4. Efficient Logistics: Our professional international logistics team offers a choice of multiple shipping channels—including sea and land transport—to guarantee the punctual delivery of your cargo.