Why Do Plants Need Nitrogen? Plant Growth Facts Worth Knowing!

Akinwalere Olaleye
Oct 12, 2023 By Akinwalere Olaleye
Originally Published on Dec 07, 2021
Nitrogen is an essential constituent of plant growth
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Age: 3-18
Read time: 8.5 Min

Nitrogen is an essential constituent of plant growth.

Nitrogen is present in good soil and provides nutrients to plants, allowing them to develop and produce fruit or vegetables. Nitrogen is a significant component of chlorophyll, the element that allows plants to utilize solar energy to form carbohydrates from water and carbon dioxide.

Nitrogen is essential for photosynthesis. The green portion of leaves and stems is chlorophyll as it absorbs nutrients from light and converts it into sugars for the plant.

Plants have long been recognized to absorb inorganic nitrogen molecules from the air, such as ammonia or nitrogen dioxide, and convert them to amino acids. Manure, ground-up animal parts (blood meal, feather dust, leather dust), and seed meals are the greatest organic sources of nitrogen.

Organic matter can be added to soil to offer plant nutrients such as nitrogen and to improve the soil's physical properties naturally. Low-nitrogen organic waste can induce nitrogen deficits in plants when microbes break down organic molecules.

Nitrogen-rich manure is a tried-and-tested method of encouraging healthy plant development. It is also a big part of amino acids, which are the building blocks of proteins.

Plants wither and perish when they are deprived of proteins. Nitrogen is obtained by plants through a natural mechanism. Bacteria in the soil transforms nitrogen to ammonium, which plants absorb through a nitrogen fixation process.

Nitrogen is required by plants for the production of amino acid residues, proteins, and DNA. A variety of vegetable garden plants require nitrogen side treatments.

If you like this article, you may find it interesting to find out why plants need sunlight and why plants need water here on Kidadl?

How do plants use nitrogen?

Nitrogen is the nutrient that causes the largest yield response in agricultural plants, stimulating fast vegetative development and a healthy green hue. Nitrate (NO3-) and ammonium (NH4+) ions are taken up by root parts in their inorganic forms.

Nitrogen for plants is obtained through a natural mechanism. Nitrogen is added to the soil via fertilizers, as well as animal and plant matter.

Through a nitrogen fixation process, bacteria in the soil converts nitrogen to ammonium and nitrate, which plants take. Nitrogen is required by plants for the production of proteins, amino acids, and DNA.

The nitrogen contained in the atmosphere is incompatible with plant growth. Nitrogen is a mineral that plants require for growth, development, and reproduction.

Despite the fact that nitrogen is one of the most plentiful elements on the planet, nitrogen insufficiency is the most prevalent nutritional issue affecting plants globally because nitrogen from the atmosphere and the earth's crust is not immediately available to plants.

Healthy plants normally have 3-4% nitrogen in their above-ground tissues. In comparison to other nutrients, this is a substantially greater concentration.

The only other nutrients present in large amounts are carbon, hydrogen, and oxygen, which do not play a substantial role in most soil fertility management schemes. Since nitrogen is a significant element of chlorophyll, the molecule that allows plants to utilize solar energy to form carbohydrates from water and carbon dioxide, it is extremely vital.

This process is called photosynthesis. It is also a major compound of amino acid residues, which are the building blocks of protein.

Energy-transfer substances such as ATP include nitrogen (adenosine triphosphate). Adenosine triphosphate (ATP) permits cells to preserve and use the nutrients generated during metabolism. Finally, nitrogen is present in nucleic acids such as DNA, the genetic material that allows cells, and eventually whole plants, to grow and reproduce. Without nitrogen, there would be no life as we know it.

Plants with a nitrogen deficit have limited growth, which varies depending on the amount of nitrogen. The growth of leaves becomes slow, especially the growth of younger leaves. Longitudinal shoot development and thickness increase are also both slowed.

Nitrogen deficiency is related to soil type and is common in sandy, well-drained soils with rapid nitrogen loss. Nitrogen deficit is caused by standing water induced by excessive irrigation and heavy rains. The uptake of water-soluble nutrients by plant roots is hampered by a lack of soil moisture.

When there is too much nitrogen, however, it causes an explosion of foliage growth at the price of flower production, fruit fix, and root growth. Too much nitrogen can create problems with stability, nutrient leaching, and over-stimulating top growth.

Some fertilizers have a 'quick release' composition that allows for rapid greening but no long-term health benefits.

Using only fertilizers to feed your garden or lawn causes the grass to go into a high-stress 'starvation cycle'. Many commercially available fertilizers either contain too little or too much slow-release nitrogen or both.

What is the nitrogen cycle?

The nitrogen cycle process is basically a biogeochemical process that converts nitrogen into numerous forms before returning it to the atmosphere through soil and organisms. Some of the processes involved are nitrogen fixation, degradation, putrefaction, nitrification, and denitrification.

There is biological and chemical nitrogen gaseous form of microorganisms. Organic nitrogen may be present in living organisms and is passed down the supply chain via the consumption of other living species.

Large amounts of inorganic nitrogen can be found in the environment. Microorganisms that work together to transform inert nitrogen into useful forms like nitrites and nitrates give it accessibility to plants.

In order to maintain an ecological balance, nitrogen undergoes a number of changes. The marine nitrogen cycle is one of the most complex biogeochemical cycles, affecting a wide variety of biomes.

The nitrogen cycle is responsible for bringing inert nitrogen from the air into the metabolic process of plants and eventually to mammals. A plant requires nitrogen to make chlorophyll, so the nitrogen cycle is critical to the survival of its life.

The nitrogen cycle is a biogeochemical cycle in which nitrogen is changed into a variety of chemical forms as it passes through ecosystems such as the atmosphere, land, and sea. Both natural and physiological methods can be used to convert nitrogen.

Plants wither and perish when they are deprived of proteins. Many of the biochemical events on which life is built are made possible by proteins, which operate as structural components in plant cells and as enzymes in others.

Why do plants need fixed nitrogen?

Any natural or artificial activity that causes free nitrogen (N2), a relatively innocuous nitrogen gas abundant in the atmosphere, to mix chemically with other elements to generate more reactive nitrogen compounds such as ammonia, nitrates, or nitrites is beneficial.

Nitrogen (N), phosphorus (P), and potassium (K) are the three most essential nutrients for plant development. Plants require large amounts of nutrients for development and survival, so these important nutrients are frequently the first to go missing from soil.

These elements can organically seep from soil due to the weather, particularly during wet or hot seasons.

These nutrients are not always present in sufficient quantities in soil for a plant to thrive. This is why many farmers and gardeners get their soil analyzed so they can choose which fertilizers to use and which nutrients to add to the soil based on the plants they cultivate.

The nitrogen element does not react with other elements under normal circumstances.

Nitrogenous molecules, on the other hand, can be found in all fertile soils, all living organisms, many foodstuffs, coal, and naturally occurring substances like sodium nitrate (saltpetre) and ammonia. Every live cell's nucleus contains nitrogen, which is one of the basic components of DNA.

Nitrogen fixation is the process of converting relatively non-reactive atmospheric nitrogen into more reactive molecules (nitrates, nitrites, or ammonia). Such reactive forms are good for plants and help them to flourish. Nitrogen shortage, on the other hand, stunts crop growth and development.

Soil bacteria is responsible for approximately 90% of natural nitrogen-fixing plants on our planet. Lightning and UV radiation are abiotic natural inducers. Nitrogen can also be repaired industrially or using electrical equipment.

Why do carnivorous plants need nitrogen?

Carnivorous plants, which are photosynthetic and live in low-nutrient settings, use their prey as a source of nitrogen and phosphorus. Due to the persistent damp conditions, swampy soils are frequently deficient in nutrients. Plants in these places have a difficult time getting enough nitrogen. Nitrogen is required by all plants and is a fundamental component of commercial nitrogen fertilizer.

Nitrogen is found in proteins (such as enzymes), nucleic acids (such as DNA), and the chlorophyll pigment, which plants utilize for photosynthesis. Insects are high in protein and nucleic acids, making them a rich supply of nitrogen for any plants that can capture them. As a result, plants capture insects not for food but for additional nutrients.

A carnivorous trap's objective is to capture nitrogen for the plant, which is necessary for photosynthesis via chloroplasts. Due to the amount of nitrogen absorbed by these traps is so great, the plant does not require a significant photosynthetic advantage to prefer carnivory.

Why do aquarium plants need nitrogen?

High quantities of nitrate from inorganic sources (such as potassium nitrate, KNO3), on the other hand, are not harmful to many aquarium creatures, making it a fairly easy type of nitrogen fertilization.

Animal food and plant components, as well as animal waste, decompose and release ammonium into the tank. It is transformed into nitrite by bacteria.

However, in tanks with a small number of animals and a lot of plant development, these organic nitrogen sources are usually not adequate. Some plant species prefer ammonium, while others prefer nitrate, while yet others utilize both nitrogen molecules in a 1:1 ratio.

To use nitrate, a plant must convert it to ammonium, which is a very nutrient-intensive operation. However, cellular vacuoles can store nitrate ions, and they are very mobile within the plant.

Ammonium, on the other hand, is never stored. Instead, it is immediately assimilated by plants or transformed to nitrate by bacteria.

Ammonium is converted to deadly ammonia at pH levels over 7.5, and high ammonium concentrations in the water column have been linked to robust algae growth. Ammonium-based fertilizers may work well, but they must be properly adjusted to the biomass in the tank and should only be used by expert tank keepers.

Here at Kidadl, we have carefully created lots of interesting family-friendly facts for everyone to enjoy! If you enjoyed discovering why plants need nitrogen, then why not take a look at Why do woodpeckers peck wood? How to avoid a woodpecker's pecking or Why do cats bite when you pet them? What is this all about?

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Written by Akinwalere Olaleye

Bachelor of Arts specializing in English Literature

Akinwalere Olaleye picture

Akinwalere OlaleyeBachelor of Arts specializing in English Literature

As a highly motivated, detail-oriented, and energetic individual, Olaleye's expertise lies in administrative and management operations. With extensive knowledge as an Editor and Communications Analyst, Olaleye excels in editing, writing, and media relations. Her commitment to upholding professional ethics and driving organizational growth sets her apart. She has a bachelor's degree in English Literature from the University of Benin, Edo State. 

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