Mineralisation: Definition, Factors and Sample Questions

Soil organic matter nutrient concentrations in forests vary with regional variances in soil types and parent material and can be influenced by forest type and management intensity. Microbial carbon and nutrient usage efficiency, as well as the rates of OC-to-nutrient mineralization, are said to be affected by changes in organic carbon (OC)-to-nutrient ratios in soils. 

Mineralisation of soil organic matter (SOM) is a crucial process that converts carbon (C) and nutrients into CO₂ and plant-available forms of nitrogen (N), phosphorus (P), and sulphur (S). Microbial requirements for C and nutrients for their maintenance, growth, and the generation of extracellular metabolites such as enzymes can promote carbon mineralization, which is strongly linked to the release of minerals N, P, and S.

Nitrogen is regarded as a necessary component for the growth of field crops. Root systems and plant growth are stunted, older leaves turn yellow, and the yield is low in crude protein when nitrogen is lacking. Too much nitrogen in the soil can cause the maturation process to be slowed and excessive vegetative growth at the price of grain output.The nitrogen cycle contains the mineralization process.

Read More: Pollen Grains

Keyterms: Soil, Mineral, Nitrogen, Phosphorus, Sulphur, Carbon, Carbon Dioxide, Enzymes, Mineralisation, Crops, Root systems, Nitrogen cycle, Protein

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What is Mineralisation?

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Mineralisation is the process of converting chemical substances into organic matter, or breakdown in layman's terms. Biological mineralisation, bone mineralisation, soil mineralisation, organomineralisation, inorganic mineralisation, and so on are examples.

The concept of mineralisation varies based on the type of mineralisation that is occurring.

It is characterized in terms of bone as the process by which the organic bone matrix is filled by a highly precise order of nanocrystals of calcium phosphate. Osteoblasts carry out this process, which is aided by an osteoid matrix. The osteoid matrix is made up of type I collagen fibers organized in micro and macro structures to form a bone. Biomineralisation is the process by which living organisms create a specific form of mineral in order to harden the tissues' existing structure. Mineralised tissues are the name for these sorts of tissues.

Also Read: Leaching

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Factors that Affect the Rate of Mineralisation 

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• The number of minerals and organic materials in the soil
• Temperature, pH, and soil moisture content
• Type of soil
• In an acidic environment, the mineralization process is sluggish.
• In a warm environment, the rate of mineralization increases, and it fluctuates with the seasons.
• Because nitrogen-fixing bacteria are abundant in the root nodules of legume crops, the process of mineralization is accelerated.

Also Read: Humification

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Mineralisation and Immobilisation

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mineralisation and immobilization are two words that are mutually exclusive. Mineralization is the process of converting organic matter into mineral nutrients that are easily taken by plants, whereas immobilization is the process of mineral uptake by soil bacteria and conversion to organic matter that is inaccessible to plants. 

Decomposition results in mineralisation or immobilization depending on the carbon to mineral ratio. If the C/N ratio is high, for example, immobilization is favored, and microorganisms may be able to absorb ammonia and nitrates from the soil. On the other side, if the C/N ratio is low, organic N mineralization occurs.

More fast mineralisation can be achieved by increasing soil organic matter using legume residues. As the legume residues are depleted in the summer and autumn, the rate of mineralization may be high. This suggests that the rate of mineralization in the soil without legumes will be the same or lower in the subsequent crop. When planning fertilizer application rates, growers should keep this in mind.

The weather conditions that affect the mineralization process can also have an impact on nitrogen losses, such as the leaching process, which is greatest in wet winters on sandy soils, and denitrification, which is the loss of soil nitrate as nitrogen gas, which occurs primarily on saturated heavy soils in summer. As a result, rather than focusing on individual losses, producers should focus on enhancing nitrogen use efficiency by determining the best nitrogen treatment rates and timings.

Also Read: Flower structure 

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Difference Between Mineralisation and Immobilization

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Also Read: Fragmentation

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Things to Remnember

• Decomposition is the process of converting organic substances into inorganic compounds in various ways.
• The amount of nitrogen mineralization is determined by three variables:

1. The amount of nitrogen in the soil.
2. Temperature.
3. The amount of water in the soil.

• The amount of mineralization is predictable during the growth stage and can be anticipated over time. According to research, leaving the stubble on the soil's surface does not speed up the mineralisation process. In contrast to soils in western Europe and North America, where disturbance by farming causes a considerable increase, the mineralisation process in Australia is not greatly accelerated by cultivation. In Australia, measurements show no influence, which can be attributed to our mild cultivation methods.

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