Wednesday , April 26 2017
Home / Articles / Fertilizer Industry (page 5)

Fertilizer Industry

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 …

Read More »

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 …

Read More »

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. …

Read More »

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 …

Read More »

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 …

Read More »

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 …

Read More »

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 …

Read More »

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 …

Read More »

Chemical weathering of Silicates

The most important silicates are quartz, feldspar and certain Ferro magnesium minerals  Weathering products of common silicate minerals Minerals Composition Decomposition products Minerals Others Olivine (Fe, Mg)2SiO2 serpentine, limonitehaematite, quartz Some Si in solution, carbonates of Fe and Mg Pyroxenes Fe, Mg Clay, calcite, limonite Some Si in solution, carbonates …

Read More »

Soil Forming Factors

The soil formation is the process of two consecutive stages. The weathering of rock (R) into Regolith The formation of true soil from Regolith The evolution of true soil from regolith takes place by the combined action of soil forming factors and processes. The first step is accomplished by weathering …

Read More »