What factors influence the microbial activity of soils?

Asked by: Hector Bautista | Last updated: December 12, 2021
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According to Jenkinson (1992), the factors involved in microbial activity, such as temperature, pH, humidity, availability of oxygen, inorganic nutrients and accessibility to the substrate, influence the decomposition of organic matter.

What is microbial activity in soil?

Microbial activity develops based on intrinsic and extrinsic factors to the soil system, which is why it is an indicator of soil dynamics and the health of the resource, since good microbial activity can be a reflection of optimal physical and chemical conditions that allow development…

What is soil microbiology?

Its objective is to study the microscopic population of the soil and its participation in the transformations that occur in the soil, in addition, it studies the importance of this population for plant nutrition and crop yield. …

How is soil microbial activity measured?

Generally, a soil with a high content of organic matter has a high microbial activity, which can be evaluated by microbial respiration. Microbial respiration is defined as the uptake of oxygen or the release of carbon dioxide by bacteria, fungi, algae, and protozoa.

How does pH influence the growth of fungi and bacteria?

pH is an important factor influencing the growth of microorganisms. Some bacteria generally grow at low pH (3.0) and fungi also thrive at low pH (1.0). However, the optimal pH range for bacteria is from 6.0 to 8.5 and only a few prefer a pH of 8.5 or higher.

15 related questions found

What is the pH that favors the growth of yeast?

Results. The effect of pH is significant on the growth of bacteria, molds and yeasts. For bacteria, pH 5 was the most influential in both piles and for molds and yeasts, pH 8 and 9 in aerated piles.

What pH favors fungi?

Fungi tolerate a wide range of pH (2.5 – 7.5), in general they support acid medium better than alkaline medium.

What can be measured on the ground?

Structure, bulk density, aggregate stability, infiltration, topsoil depth, water storage capacity, and saturated hydraulic conductivity are the physical characteristics of soil that have been proposed as indicators of soil quality.

How is soil quality measured?

The state of soil health can be determined in two different ways. One of these is the determination of an absolute rating for soil health based on deviation from a soil with ideal properties (depth, fertility, good management and adequate water supply, etc.).

How would you measure the soil?

Take a sample of soil, previously dried at about 40ºC for several hours. Sieve the sample with a 2 mm sieve. Take a sample and weigh 20 g of soil. Add the sample to a beaker with 50 mL of distilled water.

What functions does soil microbiology have?

All of them fulfill very important functions such as ensuring soil aeration, activating the mineralization of organic matter, physically capturing organic matter, recycling nutrients, adding organic matter, etc. …

What do fungi and bacteria do in the soil?

Hazardous waste reduction. Control of pests and diseases. Effects of aeration, porosity, moisture retention capacity and reduction of nutrient leaching. Root formation and protection.

What is the microbiological property of soil?

Microorganisms in the soil maintain the structure while earthworms remove the soil. Bacteria play a crucial role in the Nitrogen Cycle through several processes: Nitrogen mineralization in the soil is defined as impregnation with ammonia or ammonia component (NH3).

What is microbial activity in food?

Food microbiology is a branch of microbiology that deals with the analysis of the microbial composition of food, using standardized techniques that allow the detection of different microbial agents.3.

Which region of the soil is the most active?

They also facilitate the permeability and circulation of water and air. Clay: it is the smallest mineral fraction. Along with humus, it is the most active part of the soil.

How does pH influence soil microbial populations?

One of the most important factors is pH. A modification of this can activate or almost inactivate the enzymes of the microorganisms; pH also acts on the availability or fixation of nutrient minerals.

What is soil quality?

Soil quality means the ability of a specific type of soil to function to support plant and animal productivity, maintain or improve water and air quality, and also maintain human health and habitation. .

What is the soil quality index?

In essence, a soil quality index (SQI) is a numerical value, between 0 and 1 (it could also be expressed as a percentage, between 0 and 100%), which assesses the quality of a given soil i to meet their functions in the ecosystem, as defined in section I.

How is the quality and structure of soils altered?

The most important are erosion by water and wind. Phenomena that cause in situ soil degradation. They can be physical degradation processes (compaction, artificialization) or chemical degradation (acidification, salinization, loss of organic matter, contamination)

How is soil depth measured?

The way to measure the depth is very simple, it can be done by making a hole and measuring the effective depth with a tape measure.

How deep is the soil?

This is the depth from which root growth or water penetration is prevented or retarded. very deep, more than 150 cm; deep, from 150 to 100 cm; moderately deep, 100 to 50 cm; shallow, 50 to 25 cm; very shallow 25 to 3 cm.

What are the conditions that favor the growth of fungi?

The optimum temperature for the growth and development of fungi is between 25 and 30ºC, and can reach 40 and 45ºC, however, there are exceptions with species that grow at 0ºC and 55ºC without any problem.

What if my pH is very acidic?

The consequences of an acidic pH: Decreased activity of the immune system. Promotion of calcification of blood vessels. Loss of bone mass and muscle mass.

What is the pH of sweat?

Specifically, it is an acidic pH that varies under normal conditions between 4.5 and 5.9. The hydrolipidic film is formed by the mixture of the secretions of the sweat glands (sweat) and sebaceous glands (fatty acids, squalene and ceramides) with the products from the keratinization of the stratum corneum cells.