1、Phosphorus use efficiency and management in agriculture
About 80% of the PR ore mined annually is used to make P fertilizer. Its long-term supply is crucial to world food production. Because PR supplies are so fundamental to food security, the size and longevity of global resources are of great interest and subject to considerable debate.
2、Towards optimal use of phosphorus fertiliser
Here, we use meta-analysis to synthesize yield responses to P fertilisation in grasslands, the most common type of agricultural land, to identify under which conditions P fertilisation is...
3、(PDF) The enigma of phosphorus fertilizer utilization
Phosphate deficiency in agriculture has often been addressed by applying phosphate fertilizers, but the phosphate use efficiency in plants is only 5-25% due to the rapid fixation into...
4、The Enigma of Fertilizer Phosphorus Utilization
The primary questions to be answered in this chapter are: What are “ the factors governing the utilization of fertilizer P and what are the circumstances under which a complete (100 %) utilization of fertilizer applied P can be expected. ”
5、Global analysis of phosphorus fertilizer use efficiency in cereal crops
With 865 observations from 82 papers we investigated how PFUE in cereal crops was affected by climate (mean annual temperature), soil (pH, texture, available P), and management factors (crop type, fertilizer type and amount).
Management Strategies to Optimize Soil Phosphorus Utilization and
The supplemental material includes two figures depicting the average amount of P fertilizer applied and P uptake in each province of China, and phosphate rock reserves, P fertilizer production, and consumption in China.
The Crop Phosphorus Uptake, Use Efficiency, and Budget under
The long-term combined application of organic fertilizer and chemical fertilizer significantly increased the utilization rate of phosphorus fertilizer and the ratio of residual fertilizer phosphorus to soil available phosphorus, which was beneficial to improve soil phosphorus fertility.
PowerPoint
Changes in the soil nutrient content after an optimum P supply has been achieved if fertilizer rates are calculated on basis of the P utilization within the year of application (1), the...
Global data on fertilizer use by crop and by country
Understanding how much inorganic fertilizer (referred to as fertilizer) is applied to different crops at national, regional and global levels is an essential component of fertilizer...
The Enigma of Fertilizer Phosphorus Utilization
This chapter summarizes the chemical behavior of fertilizer-derived phosphorus in soils, and it presents a novel approach to assess the fertilizer phosphorus utilization completely and reliably as a tool to quantify the genuine phosphorus demand of agricultural crops.
The average utilization rate of phosphate fertilizer typically refers to the ratio of available phosphorus content in the soil to the total amount of phosphate fertilizer applied. This ratio reflects the effectiveness and utilization efficiency of phosphate fertilizer in the soil and serves as an important indicator for evaluating its application effects.
- Definition and Calculation Method:
The average utilization rate of phosphate fertilizer can be calculated using the following formula:
[ ext{Average Utilization Rate of Phosphate Fertilizer} (\%) = left( frac{ ext{Available Phosphorus Content}}{ ext{Total Amount of Phosphate Fertilizer Applied}} ight) imes 100 ]
Here, "available phosphorus content" refers to the amount of phosphorus in the soil that can be absorbed and utilized by plants, including water-soluble phosphorus and poorly soluble phosphorus. The "total amount of phosphate fertilizer applied" represents the actual total quantity of phosphate fertilizer used.
- Determination of Available Phosphorus Content:
The measurement of available phosphorus content usually requires chemical analysis. Common methods include the molybdenum blue colorimetric method, vanadium-molybdenum yellow colorimetric method, and phosphomolybdenum blue spectrophotometry. These techniques quantify available phosphorus based on color changes resulting from reactions between different phosphorus forms and specific reagents.
- Calculation of Total Phosphate Fertilizer Amount:
The total phosphate fertilizer amount refers to the combined mass of phosphorus elements in all applied phosphate fertilizers, including various forms such as superphosphate (Ca(H₂PO₄)₂) and calcium magnesium phosphate (CaMg(PO₄)₆). This can be determined through weighing or measurement.
- Data Collection:
To calculate the average utilization rate of phosphate fertilizer, data on available phosphorus content in soil samples and the total amount of phosphate fertilizer applied over a specific period must be collected. This data can be obtained through field trials, long-term positioning experiments, and field observations.
- Data Processing and Calculation:
The collected data needs to be organized and preprocessed for subsequent analysis. The average utilization rate is then calculated using the formula above. It is important to note that due to the complex forms of phosphorus in soil, the effectiveness of different phosphorus forms for plants may vary, so their contributions should be considered in calculations.
- Interpretation and Application of Results:
The calculated average utilization rate helps evaluate the effectiveness of phosphate fertilizer use. A higher rate indicates that most of the phosphorus from the fertilizer is absorbed and utilized by plants, enhancing fertilizer efficiency. This metric also guides rational phosphate fertilizer application, preventing resource waste and environmental pollution from overapplication.
It should be noted that the average utilization rate of phosphate fertilizer is influenced by multiple factors, such as soil type, climatic conditions, and crop species. when assessing phosphate fertilizer effectiveness, these factors must be considered comprehensively alongside other evaluation methods.
