1、Controlled release fertilizer: A review on developments, applications

Controlled release fertilizer (CRF) plays a crucial yet necessary part in the sustainable agriculture industry. An alarming rise in call for crop production directly influences the increasing need for synthetically derived fertilizers and pesticides production.

2、HS1255/HS1255: Controlled

Proper nutrient management should include the “Four R’s” of fertilizer use: apply the right nutrient, at the right rate, at the right time, and in the right place for the selected crop (Mikkelsen 2011).

3、Appropriate amount of the controlled

The response of yield formation, nitrogen uptake accumulation and the changes of soil mineral nitrogen concentration for aerial-sown rapeseed during the growth season were investigated as affected by different amount of controlled-release fertilizer application in field experiment.

4、(PDF) Controlled and Slow

Slow and controlled release fertilizer improves fertilizer use efficiency up to 30 per cent over traditional fertilizers.

Controlled

Proper nutrient manage-ment should include the “Four R’s” of fertilizer use: apply the right nutrient, at the right rate, at the right time, and in the right place for the selected crop (Mikkelsen 2011).

Controlled

Abstract se inhibitors and stabilized fertilizers. Controlled-release ertilizers are generally coated products. Slow-release fertilizers are noncoated products in which the nutrient release is uncontrolled but slow; these are mainly urea-aldehyde reaction products but also include other slowly soluble products such as fertilizer

How To Calculate Fertilizer Application Rate For Any Crop

The fertilizer application rate is the amount of fertilizer required per unit area (acre, hectare, etc.) or per unit volume. The rate is determined by the desired nutrient concentration and the nutrient release pattern of the fertilizer.

Controlled

There are many methods to increase the productivity of fertilizers and to eliminate their negative action on the environment; however, the application of controlled-release fertilizers is one of the most impactful.

The combined application strategy of controlled

We aimed to determine the effect of one-time application of control release fertilizer on wheat grain yield and protein content and its underlying mechanisms. The results showed that different slow-controlled release fertilizers treatments had significantly different N release rates.

(PDF) Controlled release fertilizers (CRFs) for climate

To mitigate environmental issues and improve the longevity of fertilizer in soil, controlled release fertilizers (CRFs) have been developed.

Controlled-release fertilizers (CRF) are highly efficient and environmentally friendly. They use specialized chemical or physical technologies to slowly release nutrients into the soil over an extended period, meeting the nutritional needs of plants. Compared to traditional chemical fertilizers, CRFs better control dosage and timing, improve fertilizer utilization, and reduce environmental pollution.

I. Basic Concept of Controlled-Release Fertilizers

1. Definition: CRFs are fertilizers made using special processes that allow controlled nutrient release, providing sustained nutrition to plants over a long period. Compared to traditional fertilizers, CRFs reduce application frequency, lower costs, and enhance utilization efficiency.
2. Classification: Based on production methods and ingredients, CRFs include urea-based, phosphate diammonium-based, and potassium-based types. Different formulations suit specific crops and soil conditions.
3. Advantages:
   • Slow Nutrient Release: Prevents over-fertilization, balances soil nutrients, and reduces waste and pollution.
   • Higher Utilization: Prolonged nutrient supply minimizes applications, cutting costs and improving efficiency.
   • Improved Yield and Quality: Proper use promotes crop growth, increasing both quantity and quality.

II. Methods for Calculating CRF Application Rates

1. Set Target Yield: Determine reasonable yield goals based on local climate, soil, crops, and expert advice.
2. Analyze Soil Nutrients: Assess nitrogen (N), phosphorus (P), potassium (K), soil texture, and pH to understand crop nutrient demands.
3. Refer to Recommended Dosages: Check product manuals for scientifically tested CRF application rates.
4. Consider Crop Growth Cycles: Adjust for crop-specific nutrient needs at different growth stages.
5. Account for Climate: Factor in temperature, rainfall, and sunlight to ensure optimal nutrient availability.
6. Calculate Dosage: Combine target yield, soil data, crop cycles, climate, and recommended rates to determine the per-mu application.
7. Adjust for Application Method: Increase basal fertilizer before planting; reduce topdressing during growth.
8. Monitor and Adjust: Track soil and crop conditions to refine application plans.
9. Learn from Experience: Develop localized application guidelines through practice.

III. How to Use Controlled-Release Fertilizers

1. Basal Application: Spread CRF evenly before planting and till into the soil. Suitable for spring crops; avoid winter-planted crops in dormancy.
2. Topdressing: Apply additional CRF during growth stages based on plant needs. Use early growth or mid-season applications, controlling timing and amounts.
3. Foliar Spraying: For water-loving crops, spray CRF directly onto leaves for rapid absorption.
4. Mix with Other Fertilizers: Combine CRF with organic or compound fertilizers to improve soil structure. Balance ratios to avoid nutrient imbalance.
5. Key Considerations:
   • Ensure soil-fertilizer contact for effective absorption.
   • Avoid over-application; adjust plans based on crop/soil monitoring.
   • Follow regulations to protect ecosystems and human health.

IV. Tips for Using Controlled-Release Fertilizers

1. Select the Right Type: Choose CRF varieties suited to local climate, soil, and crops (e.g., high-nitrogen for N-demanding crops).
2. Combine with Other Fertilizers: Pair with organic/compound fertilizers for comprehensive nutrition, but avoid antagonistic interactions.
3. Timing and Methods: Apply during cool periods to prevent volatilization; choose sunny days for foliar spraying.
4. Clean Residuals: Remove leftover fertilizer to maintain soil aeration and prevent pests.
5. Field Management: Support with irrigation, weeding, and pest control to maximize CRF benefits.
6. Safety Precautions: Wear protective gear and adhere to legal standards during application.

V. Precautions for Using Controlled-Release Fertilizers

1. Follow Regulations: Comply with national laws and industry standards to avoid misuse. Stay updated on policies.
2. Balanced Fertilization: Mix CRF with other fertilizers carefully to prevent nutrient conflicts.
3. Optimal Timing: Avoid high-temperature applications to reduce loss; prioritize sunny days for foliar spraying.
4. Residual Cleanup: Dispose of unused fertilizer to protect soil health and prevent pests.
5. Field Care: Maintain irrigation, drainage, and pest management to ensure CRF effectiveness.
6. Operational Safety: Prioritize personal protection and equipment safety during handling.

VI. Future Prospects of Controlled-Release Fertilizers

1. Efficiency Gains: CRFs minimize resource waste and pollution compared to conventional fertilizers, boosting utilization rates.
2. Sustainable Agriculture: Reduces environmental burden, supporting eco-friendly farming practices.
3. Enhanced Crop Performance: Optimal CRF use improves yields, quality, and market value.
4. Modern Agriculture Needs: Aligns with rising demands for precision agriculture and resource optimization.
5. Technological Innovation: Drives advancements in fertilizer research and product diversification.
6. Economic and Social Benefits: Lowers costs for farmers, increases income, and accelerates agricultural modernization.

controlled-release fertilizers play a critical role in agriculture. Scientific application of CRFs optimizes resources, promotes sustainability, enhances crop value, and supports modern farming while driving innovation and rural economic growth.