Soil Atmosphere

	Back to Home
Soil the Natural Medium for Plant Growth Soil in General Physical Properties of Soil Chemical Properties of Soil Soil Water Soil Atmosphere Methane Emissions from Lowland Rice Cultivation

Soil Atmosphere

Soil Atmosphere

Major gases in soil are N₂, O₂ and CO₂ content of soil air (0.3-1.0 per cent by volume) is higher than that of the atmospheric air (0.03 per cent by volume). This is due to the respiratory activity of soil microorganisms in which O₂ is consumed leading to lower O₂ content of soil atmosphere.

In submerged paddy soils, at first anaerobiosis reduces O₂ but very soon rice roots excrete O₂ into the rhizosphere. However, reducing conditions prevail, depending on the depth.

In other situations where water logging is a perennial feature (ex: marshy soils), plants adapt their metabolism. For instance, instead of sugars, plants may end up accumulating malate. Under highly anaerobic conditions, toxic substances such as ethane, methane, hydrogen sulphide, cyanide, butyric acid and a number of other fatty acids may accumulate causing harmful effects to plant growth

	Back to Home
Soil pH Soil Structure Role of Organic Matter Synthetic Soil Conditioners Relation to Root Growth Evaluation Soil Structure

Home | Site map | Submit Article | Directory | Search