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General characteristics of soil
What is the importance of soil in agriculture
What is the importance of soil in agriculture
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“What you see depends on how you view the world. To most people soil is just dirt but to a farmer its potential.”-DOE ZANTAMATA.
Soil is a complex ecosystem; it is made up of organic materials, liquids, minerals and gases which forms a habitat for all animals and plants. We normally tend to take soil for granted but it’s much more than mud or dust. There is no life without soil because all the plants grow in soil and we either eat these plants that grow in soil or the animals that eat the plants and soil also acts as a filter for any water that passes through it.
All soils are initially formed from rocks known as parent material. The main cause of the formation of the soil is by weathering of these parent materials and weathering is the breaking down of this parent material because of different climatic conditions.
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It is seen that the major factors limiting the production in small farms is low soil fertility, shortage of water, and soil degradation. Also proper soil enrichment by farmers is not done as they do not replenish as much nutrients back to the soil as the crops take from the …show more content…
Management of soil is concerned with the ways of making the soil of better structure and quality. There are various methods employed by the farmers to do that-
1. Mulching- It is basically treating the soil with plants that were grown on it. The cut plants are put back on the soil to prevent the soil from blowing away by wind. The edible plants are used and the non- edible parts of the plant are spread on the ground. Mulch helps in reducing the velocity of runoff which helps in reducing the soil
Soil and rock are the main composition of the planet’s crust. Rock is often considered a consolidated material but soil is described as an unconsolidated remains and deposits of solid particle that have been formed by the breakdown of rocks. Soils can be grouped into two categories depending on the method of deposition. Residual soils have formed from the weathering of rocks and remain at the location of their origin. Residual soils can include particles having a wide range of sizes, shapes and compositions depending on amount and type of weathering and the minerals of parent rock. Transported soils are soils that have been relocated from their original place. Transportation may have resulted from the outcome of gravity, wind, water glaciers or human activities. Transported soil particles are often segregated according to size during the transportation process. The method of transportation and deposition has significant effect on the
In cases of a lack of vegetation soil is exposed to erosion. Wind erosion blows the top soil off especially in the sandier areas where there are finer particles. Animals or cultivation of the soil can also break down soil particles into sizes that are more susceptible to wind erosion. This can cause a build up of soils in other places. Water washing over the loose, exposed soil can also result in large volumes of soil being lost. Most Australian soils are very shallow and have most of the nutrients in the top few centimeters. Erosion that carries away these top few centimeters of soil is particularly damaging. The remaining soil is unproductive, often unable to be re–taken over by native vegetation and susceptible to further
In terms of agriculture, the potting soil is of equal and oftentimes greater quality and fertility
Compaction is a densification of the soil which reduces its biological activity, permeability, porosity, and water holding capacity, while at the same time increasing the risk of erosion due to accelerated run-off (13). While some soils are naturally compacted, mechanical pressure (i.e. heavy machinery) can compact soil (13). Erosion is a natural process which is actually essential in the soil formation process, but human activities have accelerated it (7). During erosion soil particles of the fertile topsoil are removed either by wind or water (i.e. runoff), this process is irreversible and can lead to the reduction of soil productivity (7).
There are many reasons why our soils become damaged. The three biggest contributors are: erosion, deforestation and overgrazing. Erosion can be the most damaging of all three because we cannot control the weather. Erosion exists when either water or wind removes important soil particles from the earth leaving the land useless for growth. AS Vice President Al Gore states in his book, Earth in the Balance, "Iowa has lost eight inches of the best topsoil in the country and it now resides in the Gulf of Mexico" (1992). Although we cannot control Mother Nature, we can combat erosion by insuring plant or crop growth is present to naturally to dissipate the effects of erosion. If not properly managed, the damaging effects of erosion can alter out lives both socially and economically.
Weathering is the name given to the process by which rocks are broken down to form soil. There are several different types of weathering processes, in which rocks undergo to form soil: physical, chemical, and biological. In physical weathering, rocks are broken down into finer and finer particles by means of physical attributes, such by water or freezing. When igneous rocks cool and start to crack or fracture, water can run through the cracks and break down the rocks into smaller particles to create soil. In the colder regions, ice can actually break rocks into finer particles. Or even the ocean waves can pound into rocks to create soil. In chemical weathering, rocks are broken by means of chemical attributes, such as acidification. Acid rain contains elevated levels of hydrogen ions, causing the pH level of the precipitation to be very acidic. In biological weathering, the effect of living organisms breaks down the rocks into soil, such as the effects of plant roots. Growing plant roots can exert stress or pressure on rock to form soil. For example, the video showed the lichen and fern plants growing from the igneous rocks, which can breakdown to create soil.
Soil erosion: Is the wearing away of topsoil- the nutrient-rich top layer of soil, by the natural physical forces of water and wind or through forces associated with farming activities. Soil erosion reduces cropland productivity and contributes to the pollution of nearby watercourses, wetlands and lakes.
Schaetzl, E. & Anderson, S. 2005. Soils: Genesis and Geomorphology. 1st Edition. New York: Cambridge University Press.
As agriculture has become more intensive, farmers have become capable of producing higher yields using less labour and less land. Growth of the agriculture has not, however, been an unmixed blessing. It, like every other thing, has its pros and cons. Topsoil depletion, groundwater contamination, the decline of family farms, continued neglect of the living and working conditions for farm labourers, increasing costs of production, and the disintegration of economic and social conditions in rural communities. These are the cons of the new improved agriculture.
There are many different types of soils. Some soils are all natural while others are made for certain things. Silt and clay are fine-grained soils and this means that you cannot see their grains with the naked eye. (Tracy Barnhart) There are other soils that are coarse-grained. This means that they are relatively bigger and able to see with the naked eye. (Tracy Barnhart) These include sand and gravel. (Tracy Barnhart) Organic soil is another different soil. Organic soils are all natural, but have to be mixed and packaged by humans or machines. They are made from plants and animals. (Tracy Barnhart) This soil is a very good growing soil when mixed with other soils such as silt or clay. This is also great for fields that need drained because the organic soil is not very thick and the water seeps through pores.
The physical property of clay are of extreme importance in soil science. Plant growth, and hence crop production, within any environmental condition is largely controlled by soil structure which results from reactions involving clay. The active clay material in .soil, particularly in combination with small amounts of organic matter, exerts a tremendous effect on soil properties. This effect may be on structure (the arrangement of soil particles), or on consistence (the response of the soil to mechanical manipulation). Where structure is favorable soil grains are clumped together into effectively larger aggregates so that soils have a more open arrangement and water and air can move freely and roots function normally. Where structure is unfavorable, soils tend to be heavy and impervious, and both the physical and chemical properties of the soil become unfavorable for plant growth. Soils which are low in clay,
It is also known as soil contamination and is a result of acid rain, polluted water, fertilizers, pesticides or other hazardous chemicals. The pollution of soil is a common thing these days, and it happens due to the human activities. With the rise of concrete buildings and roads, one part of the Earth that we rarely see is the soil. However, it is definitely very important to us. The plants that feed us grow in soil and keeping it healthy is essential to maintaining a beautiful planet. But unfortunately, like all other forms of nature, soil also suffers from
Soil structure is the size, shape and arrangement of mineral grains which form the soil mass. Soil structure is a major characteristic that influences all other engineering properties of the soil. Due to the processes of laterization, lateritic soils have attained distinct structural characteristics. It is an over-simplification to identify all temperate zone soils with dispersed structure and lateritic soils with concretionary structure (Remillon, 1967), lateritic soils may be on the whole more concretionary than most temperate zone soils.
The texture refers to the structure of the soil in relation to small, medium or large particles in a specific soil mass (Ball 2001). Soil texture is classified based on the amount of sand, silt and clay present in a soil sample (Schoonover & Crim 2015). A coarse soil is a sand or loamy soil, a medium soil is a loam, silt loam or silt whereas a fine soil is a sandy clay, silty clay or just clay (Ball 2001). The particles of the clay are very small which means they have a large surface area (What is Soil Texture? 2017). Due to the surface area, the water gets stuck well to the clay and its ability to retain moisture gets high (What is Soil Texture? 2017). If the surface area is high, more area is available for positively charged plant nutrients
Soil erosion occurs when soil is removed through the action of wind and water at a greater rate than it’s formed.