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Fertilizers Definition And Classification Essay

Fertilizers

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Fertilizers are substances added to the soil sprayed on leaves of plants to help them grow better or in some cases faster. Plants need twenty essentail elements to help them grow. Plants make carbohydrates. A plant needs nitrogen, phosphorus, potassium, calcium, sulfur, and magnesium the most to grow healthy. Most soils naturally contain enough trace elements for field crops, but such elements must be added when certain fruits and vegetable plants are grown. Nitrogen, phosphorus, and potassium are the top three elements needed in plant growth. Legumes are plants which absorb nitrogen gas from the air and bring the gas to the ground. Legumes are planted over with other crops and those plants get the required amount of nitrogen and grow healthy.

     There are two kinds of fertilizers. There is organic and inorganic. Organic fertilizers are bonemeal, fishmeal, blood, and farmyard manuer. Inorganic manuer is Nitrogen, potassium or any other element necessary in the aid of plant growth. If one accidently digests inorganic fertilizer, he or she must see a doctor as soon as possible. One can get red eyes, itchiness, and or stomach problems.

     During World War 2, the government built many factories to absorb nitrogen gas from the air and to use them in explosives. Soon after the war, these factories were used to absorb nitrogen gas and to be used as a fertilizer. This method was inexpensive and farmers were now actually making a profit. By 1985, farmers used approximately eleven million tons of nitrogen a year. This is eight times more than what farmers used in 1950.

     The most widely used fertilizer is pure ammonia. It is kept in liquid form under pressure in steel tanks. Three solid nitrogen fertilizers are ammonium sulfate, ammonium nitrate, and ammonium phosphate. Two common phosphorus fertilizers are superphosphate and triple superphosphate. Phosphorous fertilizer is made by treating phosphate rock with sulfuric acid. Potassium sulfate and potassium nitrate are used on crops that are harmed by chlorides.

     The term straight fertilizer stands for any material that supplies one of the three principal macronutrients. The three macronutrients are nitrogen, phosphorus, and potassium. Mixed fertilizers are fertilizers that supply more than one macronutrient. This information is neccesary to one who is intrested in purchasing fertilizer. The fertilizer companies or manufacturers basically list every package or container with three numbers. For example a package that says 4-16-18, contains 4 percent nitrogen, 16 percent phosphoric oxide, and 18 percent potassium oxide.

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Farmers need expert advice on which type of fertilizer will work best on different plants. Also a farmer must know if the cost of the fertilizer is worth the profit the crops will bring.

     Natural fertilizers are said to be better because they help the soil retain moisture. They also resist erosion. They do not contain as much nutrients as chemical fertilizers of hte same weight, but farmers prefer natural fertilizers over chemical fertilizers. Farmers believe that more wholesome plants grow in soil treated with these organic materials.

     Manure is the most important organic fertilizer. It is a mixture of solid and liquid animal wastes. Every year livestock in farms in the United States of America produce at least one billion tons of manure. A small percentage of this manure is spread on fields, but a major portion is dried, ground, and sold for use in small gardens. Another organic fertilizer is guano. Guano is the waste of either birds or bats. Sludge is a fertilizer which comes from the sewage system disposals. Other fertlizers are either found from the waste at meat-packing factories and/or uneatable fish.



Essay about The Use of Fertilisers and Pesticides in Agriculture

2416 Words10 Pages

The Use of Fertilisers and Pesticides in Agriculture

Agriculture today dominates the majority of all land uses. As a result it has a fundamental role in maintaining the countryside and protecting the environment. The development of the use of fertilisers and pesticides has dramatically increased the efficiency of food production and has in fact more than quadrupled food production in the last century[1]. They also have reduced the cost and increased the variety of foods available. However, there are serious consequences to the uses of many of these pesticides and fertilisers and they have resulted in various environmental problems.

Fertilisers:

In a natural ecosystem plants eventually die…show more content…

Also as it is often used as a waste product on mixed farms, applying farm manure to a plant crop is a useful way of disposing of this waste.

The most commonly used fertilisers are the soluble inorganic (chemical) fertilisers. They are products of natural rocks; and contain cations and anions in a concentrated form. These cations and anions are the same as those that occur naturally in fertile soil[3]. There are usually three primary nutrients within these chemical fertilisers (although are contained in organic fertilisers too); all of which have certain properties playing an important part for increasing a higher yield in agriculture. These are Nitrogen, Phosphorus and Potassium (NPK).

· Nitrogen is fundamental for leaf growth, which is where photosynthesis mainly takes place; therefore vital in increasing crop yields. Nitrogen also contains a number of proteins, so therefore also affecting the quality of the crop.

· Phosphorus is important for cell division so therefore is needed by parts of the plant that are growing rapidly. It is found in many of the organic substances the plant produces, i.e. nucleic acids, ATP.

· Potassium is used for both respiration and photosynthesis.

These are contained in a mixture of chemical compounds such as ammonium nitrate, calcium phosphate and potassium sulphate. By adding these

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