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Nitrogen is an essential mineral for the overall health and optimum growth of plants. Luckily, it’s naturally abundant and can be harvested from many natural sources. It’s also possible to synthesize nitrogen-rich sources inorganically.
Here’s a list of fertilizers high in nitrogen:
- Anhydrous Ammonia
- Urea
- Ammonium Nitrate
- Urea-Ammonium Nitrate (UAN)
- CAN (Ammonium Nitrate + Limestone)
- Ammonium Sulfate
- Di-ammonium Phosphate
- Hair
- Calcium Nitrate
- Feather Meal
- Blood Meal
- Cottonseed or Canola Meal
- Alfalfa Meal
- Bone Meal
- Manure
- Urine
- Compost
Some of these materials may be rich in nitrogen but cannot be applied directly into the soil as they may be harmful to the plants. This article will discuss in detail how much nitrogen each fertilizer has, how it can be maximized and safely incorporated into the soil, and the benefits of its other components.
1. Anhydrous Ammonia
Anhydrous ammonia (NH3) contains 82% nitrogen—the highest among commercial fertilizers.
Experts synthesize ammonia by capturing nitrogen from the atmosphere and converting them into anhydrous ammonia through the Haber-Bosch process. Farmers then inject pressurized liquid ammonia into the soil through tractor-drawn knives.
Since anhydrous ammonia readily escapes into the atmosphere, farmers need to inject the fertilizer at least 10 – 20 cm (3.9 – 7.9 inches) deep to prevent immediate loss through evaporation.
Once released into moist soil, ammonia reacts with water and turns into ammonium (NH4), which binds to organic matter. This process reduces the risk of ammonia being leached away in case of heavy water flow. Eventually, the ammonium is converted into nitrates (NO3)—the form which plants can easily absorb.
Meanwhile, gaseous ammonia reacts readily with water, making it dangerous for the human body to absorb. Therefore, farmers must observe correct methods and use appropriate clothing or gear when handling such compounds.
Although ammonia contains the highest amount of nitrogen, it’s not as widely used as urea due to the higher health and environmental risks.
2. Urea
Urea is an essential compound naturally found in the urine of most mammals. Scientists can also synthesize the product in the laboratory through the chemical process called Wöhler Synthesis. This process helped significantly in the mass production of urea.
Many companies produce large amounts of urea annually to meet the high demands in farming as it’s one of the best nitrogen sources. It contains 46% nitrogen and is widely used in animal feeds and fertilizers.
It’s best to add urea to moist soil to initiate a reaction. The compound has to undergo three chemical reactions before the plants can use any of its nitrogen components.
Many plants and microorganisms in the soil contain urease—an enzyme responsible for the breakdown of urea into ammonia. This enzyme requires water to function. In addition, water is also necessary to convert ammonia into ammonium.
Next, the soil microorganisms will convert the ammonium molecules into nitrates that plant roots can easily absorb.
However, it may be important to remember that plants cannot absorb all of the nitrogen present in urea as some of them can be lost in the air naturally because the compound is a volatile substance. It can also lose nitrogen due to high temperatures or high pH in the soil.
Soil temperatures over 80 °F (26 °C) and pH levels above 7.0 may result in faster urea breakdown and nitrogen loss, resulting in reduced nitrogen intake among plants. Temperatures between 45 and 60 °F (7 – 15 °C) and pH levels between 5.0 and 6.0 can effectively delay nitrogen loss through evaporation.
Check out my article that explains the difference between urea and CAN fertilizer.
3. Ammonium Nitrate
Ammonium nitrate (NH4NO3) contains 34% nitrogen and is widely used in commercial fertilizers and explosives. While it’s a good source of nitrogen for crops, some countries ban or regulate its distribution due to its high risk of being used for explosives.
Nonetheless, it works great as a fertilizer because the compound’s nitrogen components are equally divided into ammonium and nitrate molecules. The nitrate part is readily available for plants to absorb upon application into the soil. The ammonium provides a nitrogen supplement for a later uptake.
Nitrates are highly water-soluble and are significantly affected by water flow. This property makes it convenient to apply ammonium nitrate through top-dressing and allows for an even distribution of the fertilizer on a wide piece of land.
However, while the nitrogen from nitrates doesn’t dissipate quickly through evaporation, chances are it may be lost through leaching. It’s highly likely during the rainy season in fields or gardens with loose, sandy soil.
Eventually, when the soil dries up, the nitrates stuck beyond the reach of plant roots will be decomposed by soil microorganisms, releasing nitrogen gas that may be lost through the air.
4. Urea-Ammonium Nitrate
Urea-ammonium nitrate is a liquid fertilizer that combines the two compounds and contains 28 – 32% nitrogen. This formulation makes it more convenient to apply the fertilizer along with some herbicides or incorporate it into a foliar spray.
Its liquid form also makes it popular for home gardeners who handle only a few plants. However, it may lead to foliar burn when you apply it directly onto the surface of leaves.
In addition, nitrogen loss is also possible through evaporation or leaching, further reducing the amount of the nutrient that the plant can actually consume.
5. CAN (Ammonium Nitrate + Limestone)
Calcium ammonium nitrate (CAN) is a combination of ammonium nitrate and a calcium source, such as limestone or calcium nitrate Ca(NO3)2. It contains roughly 27% nitrogen and 8% calcium. Half of its nitrogen components come from the nitrate part, and the other half comes from the ammonium.
It is a popular inorganic fertilizer, but its production and distribution are highly regulated since it may be used as an ingredient for explosives.
The calcium component of CAN is beneficial for plants because the nutrient helps provide structural support and functions as a secondary messenger for physically or biochemically stressed plants. Therefore, it’s best to use CAN when plants suffer from both calcium and nitrogen deficiency.
Check out my article that explains the difference between urea and CAN fertilizer.
6. Ammonium Sulfate
Ammonium sulfate (NH4)2SO4, also known as AMS, contains 21% nitrogen and is a good source for sulfur, another essential plant nutrient that constitutes 24% of the compound. It comes in dry, granular form, preventing nutrient loss through evaporation.
Like nitrogen, sulfur also helps with chlorophyll formation. It also helps with nitrogen fixation in legumes. Luckily, the sulfate in AMS is readily available for the plants upon application. However, it must be used only when there’s an equal need for nitrogen and sulfur.
One downside of using ammonium sulfate is its high propensity to acidify the soil, requiring farmers or gardeners to routinely check soil pH when using this fertilizer. Therefore, it’s best to use it on moist soil with a high pH level. Otherwise, you may need to employ different ways to elevate the pH more often.
7. Di-Ammonium Phosphate
Di-ammonium phosphate (NH4)2HPO4, sometimes referred to as DAP, is an excellent source of nitrogen and phosphate, which are both essential for plant and root growth. It contains 18% nitrogen and 46% phosphorus.
It is ideal to apply DAP in spring or autumn.
You must also ensure that soil has pH levels between 6.0 and 7.0 because the initial reaction will raise the pH upon application. If the substrate becomes too alkaline, the ammonium molecules will turn into ammonia and dissipate into the air, causing nutrient loss.
Meanwhile, as the ammonium turns into nitrates, the soil will eventually become acidic. Therefore, it is necessary to monitor the soil pH when using this fertilizer.
8. Hair
Human hair contains 15 – 17% nitrogen by volume and also has traces of several other nutrients essential for plants, such as phosphorus, potassium, and magnesium.
Although an excellent nitrogen source, human hair takes several years to decompose entirely, resulting in the slow release of the nutrient for plant use. Therefore, it’s not a good fertilizer by itself that you can apply directly into the soil.
Instead, some people add hair trimmings into compost, where it takes roughly two years to decompose and release nitrogen forms usable by plants. While waiting for decomposition, human hair helps with moisture retention in the compost pile.
Animal hair also contains roughly the same amount of nitrogen by volume and can make a good nitrogen source in your compost.
9. Calcium Nitrate
Calcium nitrate Ca(NO3)2 contains 15% nitrogen from its nitrate part, resulting from the reaction between nitric acid and limestone. This inorganic fertilizer comes in dry, granulated form, making it easier to handle and store. You may need to keep it in a cool, dry place to prevent it from absorbing moisture from the air.
The compound also has the additional benefit of preventing root rot and maintaining overall plant health. This nitrogen-rich fertilizer is best to use when the crops are also suffering from calcium deficiency.
10. Feather Meal
Feather meal is produced by processing the feather by-products from poultry farms. It contains 12 – 15% nitrogen in the form of keratin. This structure makes feather meal ideal as a semi-slow-release nitrogen source.
The feathers are treated with high temperatures of up to 300 °F (149 °C) to denature the proteins, making it easier to break down and release the nitrogen components. In addition, extreme heat makes it possible to break down and turn the feathers into powder form for a more convenient application into the soil.
However, a study showed that residues from numerous pharmaceutical products are still present in feather meal samples regardless of sterilization and heating treatments. These residues may pose serious health risks to humans when we consume plants or animals fed with contaminated feather meals.
11. Blood Meal
A blood meal is a rich, natural source of nitrogen that can be used as fertilizer. It is a by-product from cattle slaughterhouses and has been approved for use as a soil amendment. However, some people find it unethical to apply this fertilizer on crops used to feed livestock.
Since blood meal contains a relatively large amount of nitrogen, constituting 13.5% of its mass, most farmers use it on crops that require high levels of nitrogen, such as leafy vegetables, foliage plants, and flowers.
The product has become so popular that it’s relatively easy to find in many gardening and online stores. If you want to try it on your plants, check out the Burpee Organic Blood Meal Fertilizer (available on Amazon.com). It makes for an excellent organic source of nitrogen and has great reviews.
12. Cottonseed or Canola Meal
Cottonseed or canola meals contain 6 – 7% nitrogen and are potentially good organic fertilizers. They also carry other essential nutrients, such as phosphorus and potassium. These meals are waste products of oilseed processing.
A study showed that plants can efficiently use around 78% of all the nitrogen available in cottonseed or canola meal. However, the mineralization of the nitrogen components in seed meals occurs much slower than in commercial fertilizers, such as ammonium nitrate.
13. Alfalfa Meal
Alfalfa meal makes for a great fertilizer for flowering plants. Although not as much as other commercial fertilizers, the meal contains a decent amount of nitrogen at 3 – 5%. In addition, it also contains phosphorus and potassium.
The meal is prepared by drying alfalfa leaves, grinding them into a finer texture, and letting them ferment. It’s available in pellet form and used as animal feed. Some farmers also found alfalfa meal as a helpful addition to compost to speed up the decomposition of organic materials.
14. Bone Meal
While it’s used as a fertilizer mainly for its high phosphorus content, a bone meal also contains a good amount of nitrogen at 1 – 4%, depending on the source and the manufacturer. Some manufacturers supplement their products with additional nitrogen, raising the value up to 8%.
Bone meal is getting popular for flowering plants, but it’s not recommended for crops that require a large amount of nitrogen. It’s ideal for those with little to no nitrogen deficiency but can still benefit from some supplements.
15. Manure
Cattle manure contains around 0.6 – 4% nitrogen, depending on the source. The nitrogen from manure is generally readily available for plants. In addition, it carries numerous other nutrients, such as phosphorus, sulfur, and zinc, which also contribute to overall plant health.
Some advantages of using manure include its abundance and relatively lower cost than commercially available fertilizers. It also serves as a gentle nitrogen source and packs a significant amount of organic materials to help crops grow more productively.
Moreover, manure helps with moisture retention and prevents runoff, potentially reducing water loss and nutrient unavailability.
Note that when using manure as a fertilizer or an ingredient in compost, it’s best to use manure from livestock, such as cattle and goats because they feed on organic food. Manure from house pets feeding on commercial feeds may contain substances harmful to crops.
16. Urine
Mammalian urine contains nitrogen in the form of urea. Urine from healthy humans generally contains roughly 2% urea. It also contains traces of potassium and phosphorus, which are also primary nutrients required by plants.
The amount or percentage of urea in urine greatly depends on the source’s diet and lifestyle. Under normal conditions, the human body produces 12 – 20 grams of urea every 24 hours. Meanwhile, cattle, sheep, and other mammals release varying amounts of urea in their urine.
However, the urine of house pets feeding on commercial pet food does not make good fertilizer and may even be detrimental to plants due to some ingredients that may be present in the pet food.
If you plan to use urine as a fertilizer or plant additive, it’s best to dilute it in at least ten parts water for every part of the urine. You may need to dilute it in a larger amount of water if it’s too concentrated or has to be applied to young potted plants.
Although urine may seem to be an excellent alternative to expensive commercial fertilizers, it may be difficult to apply frequently as there’s a risk for inconsistency in the concentration of essential nutrients. Urine fertilizer must be used only once a week as a rule of thumb.
This information also clarifies that while urine does provide some nitrogen for plant use, the amount is not enough during the early reproductive and late vegetative stages of plant growth when they need the highest amount of nitrogen.
17. Compost
Compost ideally contains 30 parts carbon for every part nitrogen. The nitrogen values largely depend on the kind of nutrient-rich organic materials added to the pile. Therefore, it’s rather challenging to determine the actual amount of nitrogen present in a pile of compost.
Rough estimates put the value at around 2% nitrogen by the end of the composting process. That said, compost still makes for an excellent soil amendment to provide a good balance of nutrients necessary for healthy plant growth.
This table summarizes these fertilizers rich in nitrogen, in the order of their nitrogen percentage:
| Fertilizer | Percentage / Value |
| Anhydrous Ammonia | 82% |
| Urea | 46% |
| Ammonium Nitrate | 33 – 34% |
| Urea-Ammonium Nitrate (UAN) | 28 – 32% |
| CAN (Ammonium Nitrate + Limestone) | 27% |
| Ammonium Sulfate | 21% |
| Di-ammonium Phosphate | 18% |
| Hair | 15 – 17% |
| Calcium Nitrate | 15% |
| Feather Meal | 12 – 15% |
| Blood Meal | 13.5% |
| Cottonseed or Canola Meal | 6 – 7% |
| Alfalfa Meal | 3 – 5% |
| Bone Meal | 1 – 4% |
| Manure | 0.6 – 4% |
| Urine | 2% Urea |
| Compost | 2% |
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FAQs
Which fertilizers are high in nitrogen? ›
- Ammonium Sulfate 21-0-0.
- Crustacean Meal 4-0-0.
- Feather Meal 12-0-0.
- Blood Meal 13-0-0.
- Urea 46-0-0.
- Calcium Nitrate 15.5-0-0.
- Nitroform 39-0-0.
Nitrogen is essential in the formation of amino acids. Amino acids from proteins, which make up the physical structure of plants. The use of high nitrogen fertilizers can lead to more robust plants with more healthy leaves, flowers, and stalks.
Which fertilizer is an important source of nitrogen? ›Urea is the most common N fertilizer, but many more excellent N fertilizers derive from ammonia. For example, some ammonia is oxidized to make nitrate fertilizer. This same conversion of ammonia to nitrate takes place in agricultural soils through the microbial process of nitrification.
What is one problem with having high amounts of nitrogen in fertilizer? ›When nitrogen fertilizer is applied faster than plants can use it, soil bacteria convert it to nitrate. Water-soluble nitrate is flushed out of soils in runoff, where it pollutes groundwater, streams, estuaries, and coastal oceans.
Which fertilizer has the highest nitrogen content quizlet? ›Anhydrous ammonia has the highest N content among all N fertilizers.
Is Miracle Grow high in nitrogen? ›Ingredients. Miracle-Gro Water Soluble Plant Fertilizer includes a high concentration of nitrogen, phosphorus and potassium which are three nutrients found in all fertilizers to assist with plant growth and development. To avoid high toxicity levels, ammonium has been added to this plant food.
Where is most nitrogen fertilizer produced? ›The top producers of the major components of fertilizer include China, Russia, Canada and Morocco, with Belarus also providing a significant share of potash.
What are examples of nitrogen fertilizer? ›The most commonly used forms of nitrogen fertilizer in corn production in North America are anhydrous ammonia, urea, and urea-ammonium nitrate (UAN) solutions.
What are the 3 nitrogen sources? ›Major sources include fertilizer application to crop, nitrogen fixation by leguminous crops, and livestock waste released from feedlots and husbandry operations (fig.
What happens if nitrogen is high? ›Excess nitrogen in the air can impair our ability to breathe, limit visibility and alter plant growth. Nutrient pollution is one of America's most widespread, costly and challenging environmental problems, and is caused by excess nitrogen and phosphorus in the air and water.
Why is it important to avoid nitrogen fertilizer? ›
Excess nitrogen from fertilizer and manure pollutes water and air, eats away ozone in the atmosphere, and harms plants and animals. Excess nitrogen can also react to become nitrous oxide, a greenhouse gas that is 300 times more potent than carbon dioxide.
What does too much nitrogen do to soil? ›With too much nitrogen, plants produce excess biomass, or organic matter, such as stalks and leaves, but not enough root structure. In extreme cases, plants with very high levels of nitrogen absorbed from soils can poison farm animals that eat them [3].
Which has the highest number of nitrogen? ›Hence, 22.4 L of N2 gas at S.T.P. contains the greatest number of nitrogen atoms.
Which of the following has the highest percentage of nitrogen? ›Thus, urea has the highest percentage of N.
What is the largest source of nitrogen for plants? ›Ground-up animal parts and seed meals generally have the highest concentrations of nitrogen. Because they undergo some processing, they are more consistent in their nitrogen concentration. Major organic sources of phosphorus include, again, certain manures, as well as bone meal and pulverized rock phosphate.
Why not to use Miracle-Gro? ›The problem with MG is that the nitrogen is derived from synthetic ammonium and water soluble nitrates, producing off-chemicals that are harmful to soil microbes, worms, and all other forms of life in the soil.
What is 20 20 20 fertilizer good for? ›Description. Our 20-20-20 Garden Fertilizer is a multi-purpose, premium fertilizer that can be used in all stages of plant growth in vegetable or flower gardens. It contains equal amounts of nitrogen (20%), phosphorous (20%) and potassium (20%) to provide a balanced formula for your garden plants.
What is the best amount of nitrogen for plants? ›Soil should contain an adequate supply (40 ppm) of nitrogen (N) when the garden is planted. A soil test conducted the previous fall or in early spring is the best way to determine if more nitrogen is needed. As the plants use up the soil's supply of nitrogen they become starved for more.
Who is the largest fertilizer company in the US? ›Leading fertilizer companies globally 2022, by market capitalization. As of July 2022, Nutrien was the largest fertilizer company worldwide based on market capitalization, at 42.13 billion U.S. dollars. Wesfarmers ranked second at the time, with a market capitalization of 35.86 billion dollars.
Which crops use the most nitrogen fertilizer? ›The rates of nitrogen are the highest for sugar and fodder beets (in spite of manure application), maize, rapeseed and wheat. High rates of nitrogen are also applied on vegetables and triticale. The lowest rates are applied on rye, oats, pulses and fodder crops.
Where does America get fertilizer from? ›
The U.S. is the second or third top importer for each of the three major components of fertilizer. Top producers of the major components of fertilizer include China, Russia, Canada and Morocco, with Belarus also providing a significant share of potash.
What fertilizer is high in nitrogen and phosphorus? ›Ammonium phosphate is the leading nitrogen-phosphorus product in the fertilizer industry; high analysis, high water solubility, good physical characteristics and low production costs. The most commonly used and most economical potassium fertilizer.
Where is nitrogen fertilizer? ›In a modern plant, nitrogen fertilizer is produced from natural gas. In several transformation steps, natural gas, essentially methane, is upgraded by combination with nitrogen from the air to form nitrogen fertilizer.
What are the five types of nitrogen? ›| Nitrogen form | Symbol |
|---|---|
| Dinitrogen (Atmospheric Nitrogen) | N2 |
| Nitrate | NO3 |
| Ammonium Nitrogen | NH4 |
| Organic Nitrogen | C-NH2 (where C is a complex organic group) |
Epsom salt is not a complete fertilizer, so while it can boost the magnesium and sulfur count in soil, it won't add any of those other nutrients a plant needs to grow strong.
How many types of nitrogen fertilizers are there? ›15.2.
Nitrogen fertilizers are supplied in three forms, ammonia, nitrate and urea. Urea usually is readily hydrolyzed by the ubiquitous enzyme urease to release ammonia.
Long-term exposure to high levels of nitrogen dioxide can cause chronic lung disease. It may also affect the senses, for example, by reducing a person's ability to smell an odour. High levels of nitrogen dioxide are also harmful to vegetation—damaging foliage, decreasing growth or reducing crop yields.
What causes increased nitrogen? ›Fossil Fuels: Electric power generation, industry, transportation and agriculture have increased the amount of nitrogen in the air through use of fossil fuels.
What is considered high nitrogen? ›Organic fertilizers that are high in nitrogen include urea, which is derived from urine, feathers, dried blood and blood meal. Feathers contain 15 percent nitrogen; dried blood contains 12 percent nitrogen; and blood meal contains 12.5 percent nitrogen.
What happens if you put too much fertilizer in a plant? ›Too much fertilizer (applied too often or too much) can burn or desiccate roots, ultimately killing the plant. Too much fertilizer can also be harmful to the environment. But, fertilizers do a lot of good by providing macro and micronutrients that enhance the health and performance of plants.
Why do farmers do not add nitrogen fertilizers? ›
Nitrogenous fertiliser are not required for leguminous plants because the nitrogen fixing bacteria reside in the root nodules of the leguminous plants. These bacteria convert atmospheric nitrogen into soluble nitrogenous compounds. Q.
What happens if you add too much fertilizer to the soil? ›Excess fertilizer alters the soil by creating too high of a salt concentration, and this can hurt beneficial soil microorganisms. Over- fertilization can lead to sudden plant growth with an insufficient root system to supply adequate water and nutrients to the plant.
What plants like a lot of nitrogen? ›Responsive to extra nitrogen are: tomatoes, peppers, greens, sweet corn, pole beans, muskmelons, cucumbers, squash and okra.
Which plants don t like nitrogen? ›These vegetables should NOT have added nitrogen: sweet potatoes, watermelons, carrots, beets, turnips, parsnips, lettuce.
What fertilizer makes plants grow faster? ›High-nitrogen fertilizers are known for causing huge growth in plants, which is why many types are rich in nitrogen or include it as the main component. Fertilizers high in nitrogen will also restore bright green hues to your foliage.
What is the best way to add nitrogen to soil? ›- Add Composted Manure.
- Use a Green Manure Crop.
- Plant Nitrogen-Fixing Plants.
- Mix Coffee Grounds in the Soil.
- Use Fish Emulsion.
- Spread Grass Clippings As Mulch.
- Use an Actual Plant Fertilizer.
Nitrogen deficiency can be corrected by applying either organic or inorganic fertilisers, but nitrate or ammonium-based fertilisers work the most quickly. Any general-purpose “grow” formula will usually provide enough nitrogen to correct major deficiencies.
What fertilizer is high in nitrogen phosphorus and potassium? ›- ammonium phosphate. A material produced by reacting ammonia with phosphoric acid or a mixture of phosphoric and either sulfuric or nitric acids. ...
- potassium chloride. The most commonly used and most economical potassium fertilizer. ...
- phosphoric acid. ...
- urea.
You can increase nitrogen in soil by adding nitrogen-rich fertilizer, composted manure, processed plant-based soil amendments, homemade compost, and even by planting certain crops that can pull nitrogen down into the soil from the atmosphere. These are all great sources of nitrogen for plants.
Does coffee grounds have nitrogen? ›CORVALLIS, Ore. – Coffee grounds can be an excellent addition to a compost pile. The grounds are relatively rich in nitrogen, providing bacteria the energy they need to turn organic matter into compost.
Do coffee grounds add nitrogen to soil? ›
Adding coffee grounds directly to the soil as a fertiliser can be a good option. Coffee grounds are rich in nutrients, especially nitrogen. They also have some amount of other nutrients like potassium and phosphorous. Overall, this means that adding coffee grounds to your garden can work fairly well as a fertiliser.
What natural fertilizer has the most nitrogen? ›The richest organic sources of nitrogen are manures, ground-up animal parts (blood meal, feather dust, leather dust) and seed meals (soybean meal, cottonseed meal).
What happens when plants get too much nitrogen? ›Excess nitrogen can cause plants to grow excessively and develop overly succulent leaves and shoots, which promotes outbreaks of certain sucking insects and mites. Excessive nitrogen causes fruiting plants to produce relatively more foliage, reducing their fruit production and delaying fruit maturity.
Is cow manure high in nitrogen? ›Cow manure is rich in nutrients and is suitable for plant growth. It has 3% nitrogen, 2% phosphorus, and 1% potassium—3-2-1 NPK, making it the right type of fertilizer for almost all types of plants and crops.
Which fertilizer contains both nitrogen and phosphorus? ›Di-ammonium Phosphate popularly known as DAP is a preferred fertilizer in India because it contains both Nitrogen and Phosphorus which are primary macro-nutrients and part of 18 essential plant nutrients.
Is bone meal high in nitrogen? ›Most bone meal fertilizers have an NPK ratio around 3:15:0, meaning they are low in nitrogen (N) and potassium (K) but high in phosphorus (P). Bone meal fertilizers are an excellent source of phosphorus, which is necessary for the photosynthesis process of your plants. 2. Bone meal is a slow-release fertilizer.
What fertilizer is higher in phosphorus than nitrogen? ›However, complete fertilizers sold for flowering plants (including roses and bulbs) such as 15-30-50 or 10-30-20 contain higher amounts of phosphorus (the second number) than nitrogen or potassium and are often labeled as “blossom or bloom booster”.
Does Epsom salt have nitrogen? ›The nutrient value of Epsom salts is 0-0-0, meaning they contain no traces at all of nitrogen, phosphorus, or potassium. If you do choose to use Epsom salts on your plants, it's important that you are aware that Epsom salts are not a substitute for fertilizer.
Which plants absorb the most nitrogen? ›The best known and most common plants that contribute to nitrogen fixation are those in the legume family, Fabaceae. Plants within this family have symbiotic rhizobia bacteria within nodules in their root systems.