1、Sources and Solubilization of Phosphatic Fertilizers

The quantity of soluble mineral phosphorus in soil is usually low, and even when P fertilizers are added, phosphorus has a tendency to become less soluble. There are three main kinds of phosphorus fertilizers: biological, organic and chemical fertilizers. Phosphorus may also added in nanoparticles.

2、Phosphate bacterial solubilization: A key rhizosphere driving force

Although P fertilizers are agriculturally vital to secure crop growth and productivity, their use efficiency by crops significantly may be very low due to P fixation to soil cations.

3、(PDF) Agronomic and environmental aspects of phosphate fertilizers

This review discusses and summarizes the latest reports regarding the agronomic utilization and potential environmental effects of different types of phosphate (P) fertilizers that vary in...

4、Phosphorus fertilizer sources: What are the differences and which one

Struvite is a by-product produced in the waste streams in factories or, most often, from wastewater treatment plants. Struvite can be granulated so it can be blended with other fertilizer sources. Struvite is less water-soluble than other commercial fertilizer sources.

5、Why do fertilizers need to be soluble in water?

Urea, ammonium nitrate, calcium nitrate, potassium nitrate, and ammonium phosphate are easily soluble in water and are used extensively in the preparation of single-nutrient or multinutrient fertilizer solutions.

What Are the Water

In simple terms, a phosphorus fertilizer is “water-soluble” when most of its phosphate content dissolves in water and enters the soil solution, where roots can use it. Materials in this group include MAP, DAP, TSP, MKP, UP, phosphoric acid, and liquid polyphosphates.

Less Can Be More: Fertilizer Solubility Explained

All of these materials can release phosphorus as plant nutrients through microbial activity. Although water is critical to all life forms, there are numerous metabolic pathways in biological systems where it gets in the way and must be pushed aside; it’s called the hydrophobic effect.

Phosphorus Fertilizers

In recent years, concerns have been expressed about the effects of phosphate fertilizers on the surrounding environment associated with soluble phosphate ending up in waterways.

Zinc in ammoniated phosphate fertilizers: Solid‐phase speciation

We hypothesized that the availability of Zn in the fertilizer to plants is related to its speciation in the fertilizer. We evaluated a range of ammonium phosphate fertilizers using X-ray absorption near-edge structure and assessed the water-solubility of Zn in the formulations.

Agronomic and environmental aspects of phosphate fertilizers varying in

However, some water-insoluble or partially water-soluble P fertilizers that vary in citrate-soluble P may be as agronomically effective as water-soluble P fertilizers under certain conditions.

Phosphate fertilizers are essential chemical compounds used to provide plants with the phosphorus they need for growth. Phosphorus is a critical nutrient for plant development, photosynthesis, and the transport and transformation of nutrients. not all phosphate fertilizers are poorly soluble in water. Their solubility depends on their chemical properties and structural characteristics.

I. Classification of Phosphate Fertilizers

1. Inorganic Phosphate Fertilizers: These primarily include phosphate salts and calcium-magnesium phosphate fertilizers, such as calcium phosphate, ammonium phosphate, and potassium dihydrogen phosphate. Their low solubility in water arises from their molecular structure, which contains numerous ionic groups that interact weakly with water molecules, making dissolution difficult.

2. Organic Phosphate Fertilizers: Examples include urea and nitrate-based phosphate fertilizers. These fertilizers release phosphorus by exchanging nitrogen (from urea or nitrate) with soil phosphorus, forming plant-available phosphorus. Organic phosphate fertilizers are more soluble because their simpler molecular structures and polar groups enable stronger interactions with water molecules.

II. Solubility and Chemical Properties

1. Impact of Ionic Groups: Inorganic phosphate fertilizers contain many ionic groups, which form weak bonds with water, reducing solubility. In contrast, organic phosphate fertilizers have polar groups that form strong hydrogen bonds with water, enhancing solubility.

2. Molecular Structure: Inorganic phosphate fertilizers have complex structures with abundant ionic groups, limiting water interaction. Organic phosphate fertilizers, with simpler structures and polar groups, bond more effectively with water.

3. pH Effects: Inorganic phosphate fertilizers are often acidic, while organic ones are alkaline. Acidic conditions favor interactions between ionic groups and water, whereas alkaline environments promote bonding between polar groups and water, influencing solubility.

III. Practical Implications of Solubility

1. Enhancing Fertilizer Efficiency: To improve utilization,施肥 methods should align with fertilizer types. For poorly soluble inorganic fertilizers, adjusting soil pH can boost dissolution. For soluble organic fertilizers, slow-release agents or organic matter can延缓 nutrient loss.

2. Optimized Fertilization Techniques: Scientific practices like deep placement, band application, or spot application increase efficiency. Avoid over-application to prevent waste and environmental harm.

3. Environmental Protection and Sustainability: Responsible use and waste management of phosphate fertilizers reduce pollution. Enhancing resource recycling and sustainable agriculture practices is crucial.

while not all phosphate fertilizers are poorly soluble, differences in solubility exist based on their chemical nature. Understanding these variations helps optimize fertilizer selection, boosting agricultural productivity and economic benefits.