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Questions and Answers
What percentage of phosphorus by weight is typically found in most plants?
What percentage of phosphorus by weight is typically found in most plants?
What is the role of phosphorus in DNA formation?
What is the role of phosphorus in DNA formation?
Which process increases plant available phosphorus?
Which process increases plant available phosphorus?
What is the result of insufficient soil phosphorus on crop yield?
What is the result of insufficient soil phosphorus on crop yield?
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What happens when phosphorus levels increase in fresh water streams and lakes?
What happens when phosphorus levels increase in fresh water streams and lakes?
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What is the role of phosphorus in adenosine triphosphate (ATP)?
What is the role of phosphorus in adenosine triphosphate (ATP)?
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What is the result of mineralization?
What is the result of mineralization?
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Why is maintaining soil organic matter levels important in P management?
Why is maintaining soil organic matter levels important in P management?
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What is the result of P saturation?
What is the result of P saturation?
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What happens to phosphorus during immobilization?
What happens to phosphorus during immobilization?
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What is the optimal soil temperature range for P mineralization?
What is the optimal soil temperature range for P mineralization?
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What is the effect of precise fertilizer placement on P adsorption?
What is the effect of precise fertilizer placement on P adsorption?
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What is the process called when algae die and their decomposition results in oxygen depletion, leading to the death of aquatic plants and animals?
What is the process called when algae die and their decomposition results in oxygen depletion, leading to the death of aquatic plants and animals?
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How many pounds of P2O5 per ton of silage will a typical corn silage crop remove?
How many pounds of P2O5 per ton of silage will a typical corn silage crop remove?
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What is the primary goal of field crop management in terms of phosphorus uptake?
What is the primary goal of field crop management in terms of phosphorus uptake?
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What happens to phosphorus when it becomes unavailable through precipitation?
What happens to phosphorus when it becomes unavailable through precipitation?
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What is the primary source of phosphorus in soils?
What is the primary source of phosphorus in soils?
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What is the term for the process by which microorganisms convert organic phosphorus into inorganic phosphorus?
What is the term for the process by which microorganisms convert organic phosphorus into inorganic phosphorus?
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What is the primary goal of applying phosphorus fertilizer or manure to the soil?
What is the primary goal of applying phosphorus fertilizer or manure to the soil?
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What is the term for the removal of dissolved phosphorus from soil by vertical water movement?
What is the term for the removal of dissolved phosphorus from soil by vertical water movement?
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What is the term for the chemical binding of plant available phosphorus to soil particles, making it unavailable to plants?
What is the term for the chemical binding of plant available phosphorus to soil particles, making it unavailable to plants?
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What is the benefit of band application of fertilizer in terms of phosphorus adsorption?
What is the benefit of band application of fertilizer in terms of phosphorus adsorption?
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Why is runoff a major cause of phosphorus loss from farms?
Why is runoff a major cause of phosphorus loss from farms?
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What is the benefit of maintaining an optimum soil pH in terms of phosphorus availability?
What is the benefit of maintaining an optimum soil pH in terms of phosphorus availability?
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What is the primary difference between adsorption and precipitation of phosphorus in soil?
What is the primary difference between adsorption and precipitation of phosphorus in soil?
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What is the optimal pH range for phosphorus to be in its most plant-available form?
What is the optimal pH range for phosphorus to be in its most plant-available form?
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Which type of soil has a higher potential to adsorb phosphorus?
Which type of soil has a higher potential to adsorb phosphorus?
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What happens to phosphorus at higher pH levels?
What happens to phosphorus at higher pH levels?
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What happens to phosphorus at lower pH levels?
What happens to phosphorus at lower pH levels?
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What is the relationship between adsorption and desorption of phosphorus?
What is the relationship between adsorption and desorption of phosphorus?
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Study Notes
Phosphorus Cycle and Management
- Eutrophication is a process where algae decomposition leads to oxygen depletion, causing aquatic plant and animal death.
Phosphorus Forms and Transformations
- Phosphorus exists in various forms in soil: plant available inorganic P, organic P, adsorbed P, and primary mineral P.
- Weathering, mineralization, and desorption increase plant available P.
- Immobilization, precipitation, and adsorption decrease plant available P.
Phosphorus and Crop Growth
- Phosphorus is essential for plant growth, making up 0.2% of plant weight.
- Phosphorus is involved in biochemical processes, cell development, and DNA formation.
- Insufficient soil P can lead to delayed crop maturity, reduced flower development, low seed quality, and decreased crop yield.
- Too much P can cause algae blooms in fresh water streams and lakes.
Adsorption and Desorption
- Adsorption is the reversible chemical binding of P to soil particles, making it unavailable to plants.
- Desorption is the release of adsorbed P into the soil solution.
- Soils with high iron and aluminum contents can adsorb more P.
- Phosphorus is most plant available when soil pH is between 6 and 7.
Phosphorus Management Strategies
- Maintaining soil organic matter levels is important for P management.
- Mineralization of organic matter releases P slowly, reducing the need for fertilizer applications.
- Soil temperatures between 65 and 105°F favor P mineralization.
- Precise fertilizer placement can decrease P adsorption effects.
- Erosion control practices and band application of fertilizer can reduce P losses.
- Leaching is a concern in high P soils, especially with preferential flow or direct connections with tile drains.
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Description
This quiz covers the basics of the phosphorus cycle, its importance in agriculture, and how understanding the P cycle can aid in making informed decisions for farm profitability and environmental protection. Learn about the different forms of phosphorus and how it affects crops and the environment. Test your knowledge of phosphorus management and its impact on the ecosystem.
