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Fertilizer Industry

Physical Properties of Soil

Physical properties (mechanical behaviour) of a soil greatly influence its use and behaviour towards plant growth. The plant support, root penetration, drainage, aeration, retention of moisture, and plant nutrients are linked with the physical condition of the soil. Physical properties also influence the chemical and biological behaviour of soil. The …

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Soil Texture

Definition of Soil Texture: Soil texture refers to the relative proportion of particles or it is the relative percentage by weight of the three soil separates viz., sand, silt and clay or simply refers to the size of soil particles. The proportion of each size group in a given soil (the texture) …

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Soil Textural Classes

To convey an idea of the textural make up of soils and to give an indication of their physical properties, soil textural class names are used. These are grouped into three main fractions viz., Sand, Silt and Clay. According to the proportion of these three fractions a soil is given a …

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Soil Structure

Soil conditions and characteristics such as water movement, heat transfer, aeration, and porosity are much influenced by structure. In fact, the important physical changes imposed by the farmer in ploughing, cultivating, draining, liming, and manuring his land are structural rather than textural. Definition of Soil Structure: The arrangement and organization of primary …

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Factors Affecting Soil Structure

The development of structure in arable soil depends on the following factors: 1. Climate: Climate has considerable influence on the degree of aggregation as well as on the type of structure. In arid regions there is very little aggregation of primary particles. In semi arid regions, the degree of aggregation is greater. 2. …

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Weathering of Rocks and Minerals

Rocks and minerals are formed under a very high temperature and pressure, exposed to atmospheric conditions of low pressure and low temperature and they become unstable and weather. Soils are formed from rocks through the intermediate stage of formation of Regolith which is the resultant of weathering. The sequence of processes in …

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Physical weathering of Rocks

The rocks are disintegrated and are broken down to comparatively smaller pieces, with out producing any new substances 1. Physical condition of rocks: The permeability of rocks is the most important single factor. Coarse textured (porous) sand stone weather more readily than a fine textured (almost solid) basalt. Unconsolidated volcanic ash …

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Chemical Weathering of Rocks

Decomposition of rocks and minerals by various chemical processes is called chemical weathering. It is the most important process for soil formation. Chemical weathering takes place mainly at the surface of rocks and minerals with disappearance of certain minerals and the formation of secondary products (new materials). This is called …

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Biological Weathering of Rocks

Unlike physical and chemical weathering, the biological or living agents are responsible for both decomposition and disintegration of rocks and minerals. The biological life is mainly controlled largely by the prevailing environment. 1. Man and Animals: The action of man in disintegration of rocks is well known as he cuts rocks …

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Weathering of Minerals

There are many factors which influence the weathering of minerals. 1. Climatic conditions 2. Physical characteristics 3. Chemical and structural characteristics 1. Climatic Conditions: The climatic condition, more than any other factor tends to control the kind and rate of weathering. Under conditions of low rainfall, there is a dominance of …

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