Leaching is the loss of soluble phosphorus from sub-surface soil as water percolates vertically down the soil profile. In general, phosphorus loss by leaching is minimal compared to surface runoff. While the processes such as weathering, dissolution, mineralization, and desorption increase phosphorus availability in the soil for plant uptake, processes such as immobilization, adsorption, precipitation, runoff, and erosion decrease the phosphorus availability figure 2.
Various components of phosphorus cycle in soil can be correlated with the types of money in your bank. This phosphorus pool is largest of all the pools.
This phosphorus is unavailable for plant uptake and is comprised of primary minerals insoluble inorganic phosphate compounds and organic phosphorus compounds that do not mineralize easily. The second pool checks you carry is known as the active or labile phosphorus pool. This pool consists of adsorbed phosphorus, secondary phosphate minerals, and organic phosphorus that mineralizes easily.
The third pool cash that you carry with you is the smallest of the pools and comprised of inorganic phosphates and a small amount of organic phosphorus. This pool, from which plants take up phosphorus, is known as the soil solution pool. These three pools exist in equilibrium with each other. As plants remove phosphorus from soil solution, phosphorus is replenished by the active pool. Similarly, as phosphorus concentration in active pool decreases, phosphorus is released from fixed pool to the active pool very slowly over time.
The concentration of phosphorus available to plants at any time is very low and ranges from 0. The forms of phosphorus most readily accessed by plants are orthophosphate ions H 2 PO 4 — , HPO 4 2- whose availability depends on soil pH. Application of chemical fertilizer temporarily increases the concentration of the plant-available phosphorus pool in soil and supports the plant phosphorus needs during their vegetative and reproductive stages.
It is always a good practice to check the status of phosphorus in soil through regular soil testing before applying phosphorus fertilizers. Addition of phosphorus beyond the agronomic need of crops has minimal effect on crop yield. The phosphorus cycle diagram is an example of an explanatory model.
Diagrams demonstrate the creativity required by scientists to use their observations to develop models and to communicate their explanations to others.
Add to collection. Nature of science Scientists make observations and develop their explanations using inference, imagination and creativity. Go to full glossary Add 0 items to collection. Download 0 items. Twitter Pinterest Facebook Instagram. Email Us. A soluble heat stable protein in mitochondria from bovine heart that inhibits ATP hydrolase activity.
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