1、Phosphorus use efficiency and management in agriculture

At current production levels of 160-170 million t/year, exploitable reserves of PR may last 300-400 years or longer (van Kauwenbergh, 2010). Mineable reserves of PR ore are dynamic. Future availability depends on prices, supply–demand functions, exploration, technology development, and other factors (Scholz and Wellmer, 2013).

2、Polyphosphate‐fertilizer solution stability with time, temperature, and pH

The effect of acidification on polyphosphate-fertilizer composition requires consideration when formulating mixed ammonium polyphosphate blends with acids and trace elements for application in the field.

3、Phosphorus: Reserves, Production, and Applications

Currently, it is uncertain how large the global phosphate rock reserves are, and it is thus unclear when these will be depleted. The estimated time of depletion varies greatly among different studies, ranging from 40 to more than 400 years (Van Kauwenbergh 2010).

4、Optimizing Available Phosphorus in Calcareous Soils Fertilized with Diammonium Phosphate and Phosphoric Acid Using Freundlich Adsorption Isotherm

At the termination of incubation, soils were mixed, dried, and passed through a 2 mm sieve and stored in plastic bottles for use in adsorption studies.

5、Recovery of Ammonium and Phosphate from Wastewater by Wheat Straw

To minimize the negative impact of nitrogen and phosphorus pollution from wastewater and improve fertilizer use efficiency, a novel multifunctional slow-release compound fertilizer was prepared by recovery of NH 4+ and H 2 PO 4– from aqueous solutions onto amphoteric straw cellulose (ASC) adsorbent.

Life cycle assessment of diammonium

Optimizing the utilization efficiency of phosphoric acid, improving the reuse ratio of phosphogypsum, reducing the proportion of high-concentration phosphate fertilizer, and optimizing phosphate fertilization rate to crops in China are the key factors in reducing the overall environmental impacts.

The Chemistry and Agronomic Effectiveness of Phosphate Fertilizers: Journal of Crop Production: Vol 1, No 2

Plants take up P from soil solution, so water-soluble P fertilizers are generally more effective than poorly soluble forms. The original sources of P used for agriculture were poorly soluble materials, including manures, bones, guano and phosphate rock.

Stable suspension fertilizers from monoammonium phosphate

Satisfactory storage time was increased from 30 days to at least 90 days when the extra fluorine was added. A test of this process at a dealer site demonstrated that the pourability of a suspension fertilizer made with MAP was improved.

Research on a "Green" Industry Chain of Phosphate Fertilizer

In the production of phosphate fertilizer, large amounts of phosphorus gypsum can be produced, which can be used for the preparation of ammonium sulfate. In which process, a large number of secondary emissions-calcium carbonate residue can be produced as well, whose main mineral composition was CaCO3.

Biochar

The objective of this study was to manufacture of a granular biochar-ammonium phosphate (BAP) as an uncoated-slow release fertilizer by using the reaction among biochar (derived from rice husk), phosphoric acid and ammonia gas for fertilization of sandy soil.

The storage duration of ammonium carbonate and phosphate fertilizer mixtures depends on multiple factors, including environmental conditions, storage methods, and their chemical compositions. Under ideal conditions, proper storage allows these two fertilizers to coexist for extended periods. practical scenarios may introduce various influencing factors. Below is a detailed analysis:

I. Properties of Ammonium Carbonate

1. Chemical Composition: Ammonium carbonate typically refers to ammonium bicarbonate (NH₄HCO₃), a weakly alkaline fertilizer containing nitrogen (N), phosphorus (P), and potassium (K). It promotes plant growth.
2. Stability: Ammonium carbonate is relatively stable at room temperature and unlikely to undergo chemical reactions. it may decompose into ammonia gas and water vapor under high temperatures or humidity.
3. Shelf Life: Its longevity is temperature-dependent. Lower temperatures slow decomposition, enabling longer storage. Conversely, high temperatures accelerate breakdown, reducing effectiveness over time.

II. Properties of Phosphate Fertilizer

1. Chemical Composition: Phosphate fertilizers commonly include calcium dihydrogen phosphate (Ca(H₂PO₄)₂) or ordinary superphosphate (Ca(HPO₄)₂), serving as key phosphorus (P) sources.
2. Stability: Phosphate fertilizers remain stable at room temperature without significant chemical changes. they may absorb moisture in humid environments, leading to clumping and reduced efficacy.
3. Shelf Life: Like ammonium carbonate, phosphate fertilizer stability also depends on temperature. Lower temperatures preserve quality, while heat accelerates degradation.

III. Mixed Storage Conditions

1. Temperature Control: Temperature is critical. Ideal storage temperatures should exceed 5°C to minimize reactivity. Avoid direct sunlight or high-temperature, humid environments.
2. Humidity Control: High humidity can cause caking and reduce effectiveness. Ensure well-ventilated storage to maintain low humidity.
3. Packaging Materials: Use moisture-resistant, corrosion-proof packaging (e.g., plastic or metal drums) with secure seals to prevent air and water intrusion.

IV. Estimating Storage Limits

1. Ideal Conditions: When stored properly (e.g., above 5°C with low humidity), both fertilizers can retain efficacy for approximately 6 months each.
2. Practical Challenges: Real-world factors like elevated temperatures, humidity, improper mixing, or poor packaging may accelerate degradation, shortening storage life.
3. Recommendations:
   • Store in optimal environments (cool, dry, ventilated areas).
   • Regularly inspect for changes in appearance or odor.
   • Follow proper packaging and transportation guidelines.

The storage duration of mixed ammonium carbonate and phosphate fertilizers depends on environmental conditions, handling practices, and chemical properties. While ideal storage can extend shelf life, real-world challenges often necessitate precautionary measures. Adhering to scientific storage protocols ensures both safety and efficacy.