1、Study on Preparation and Performance of Phosphate Modified Urea

A new type of slow-controlled release fertilizer containing nitrogen and phosphorus nutrients was prepared. The structure and functional groups of the fertilizer were characterized and analyzed by means of TG, XRD and FTIR, and the changes in the surface element valence state of the fertilizer were studied by XPS.

2、Preparation of Novel Biodegradable Polymer Slow

In this study, we use urea phosphate as the reaction material and condense it with urea formaldehyde prepolymer to prepare a new type of biodegradable polymer slow-release fertilizer containing nutrient N and P (PSNP).

3、Suspension Fertilizers Based on Waste Phosphates from the

A popular option is the slow-acting urea-formaldehyde suspension fertilizers produced by the polymerization of urea and formaldehyde. According to US patent 4,526,606, a good quality urea-formaldehyde suspension fertilizer can be obtained, which additionally, leaves no color.

Recent advances in the chemistry of nitrogen

Phosphate fertilizers are obtained from rock phosphates in two ways: either by subjecting rock phosphate to high temperatures or by acidulating rock phosphates.

Soil phosphorus transformation and plant uptake driven by phosphate

Phosphate-solubilizing microorganisms (PSMs) significantly enhance the ability of plants to absorb and utilize P, which is important for improving plant nutrient turnover and yield.

Machine Learning

Urea-formaldehyde (UF), a prominent slow-release nitrogen fertilizer, faces challenges in production optimization to efficiently meet the varying slow-release needs of different crops.

托福阅读真题第211篇Soil Fertilization

Three basic types of organic fertilizer are animal manure, green manure, and compost. Animal manure includes the waste matter of cattle, horses, poultry, and other farm animals. It improves soil structure, adds organic nitrogen, and stimulates beneficial soil bacteria and fungi.

Phosphorus Dynamics in Soil

Plants can only absorb phosphorus in the form of orthophosphates, with the highest concentration being in the form of H 2 PO 4− at low pH levels. This form of orthophosphate is more readily absorbed by plants compared to HPO 42−, which increases in concentration with increasing pH levels.

Sources and Solubilization of Phosphatic Fertilizers

There are three main kinds of phosphorus fertilizers: biological, organic and chemical fertilizers. Phosphorus may also added in nanoparticles. Rock phosphate is a natural and cheap, and suits acid soils.

Common Phosphate Fertilizers and Their Application Methods

Based on solubility and ease of crop absorption, phosphate fertilizers are generally classified into four categories: water-soluble phosphate fertilizers, weakly acidic phosphate fertilizers, insoluble phosphate fertilizers, and miscible phosphate fertilizers.

Phosphate fertilizers are essential for promoting plant growth and development. not all phosphate fertilizers are equally effective at being absorbed by formaldehyde. Below are some phosphate fertilizer types that are more readily absorbed by formaldehyde:

1. Diammonium Phosphate (MAP): A common phosphate fertilizer rich in phosphorus, MAP contains high levels of nitrogen, phosphorus, and potassium. Nitrogen enhances photosynthesis and crop yield, phosphorus promotes root development and nutrient uptake, while potassium improves disease resistance and stress tolerance. MAP is an ideal choice for balanced plant nutrition.

2. Monoammonium Phosphate (PA): Similar to MAP, PA provides abundant phosphorus along with nitrogen, phosphorus, and potassium. Nitrogen boosts photosynthesis, phosphorus strengthens roots, and potassium enhances resilience. PA is another excellent option for optimizing plant growth.

3. Potassium Sulfate Compound Fertilizer: This fertilizer combines sulfur and potassium, offering essential nutrients for plants. Potassium improves disease resistance, stress tolerance, and photosynthetic efficiency, making it a valuable choice for increasing crop yields.

4. Potassium Nitrate Compound Fertilizer: Containing nitrogen and potassium, this fertilizer supports key physiological processes. Potassium enhances plant health and productivity, while nitrogen drives growth. It is highly effective for maximizing agricultural output.

5. Calcium Magnesium Phosphate Compound Fertilizer: Rich in calcium and magnesium, this fertilizer regulates plant development and stress responses. Calcium and magnesium are critical for maintaining cellular functions and improving resilience.

6. Aluminum Phosphate Compound Fertilizer: This fertilizer includes aluminum, which aids in photosynthesis and boosts crop yields. Aluminum plays a role in optimizing metabolic processes for enhanced productivity.

selecting phosphate fertilizers should align with plant nutritional needs and soil conditions. Different formulations offer unique benefits, and strategic combinations can amplify results. Additionally, proper dosage and application methods are crucial to avoid soil contamination or environmental harm.