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Agriculture Fertilizers

Posted on 08 December 2019

Fertilizers,

The use of animal manure and compost as plant fertilizers probably goes as far back as agriculture itself. Fertilizers, natural or chemical, go hand in hand with farming to improve the growth and health of plants. While soils naturally contain nutrients like nitrogen, phosphorous, calcium and potassium, repeat cycles of crop plantation drain the ground of its stores. This is where agriculture fertilizers come in; to supplement soil of its lost nutrients and to aid the healthy growth of crops and grassland. 


WHY DO FARMERS USE FERTILIZERS?

Nutrients in the form of organic matter, chemical fertilizers and plants can be added back to the soil through different sources. Native Americans would often bury fish in their corn plots which organically lent nutrients to the soil as the fish decomposed. Equally, farmers use crops like soybeans and alfalfa (legumes), that ‘pull’ (absorb) naturally-occurring nitrogen from the atmosphere to place it in the soil for future (rotational) crops cycles, while organic farmers regularly use natural today, will use either mined or manufactured agriculture fertilizers to meet and supplement their needs. 

Modern chemical fertilizers include nitrogen, phosphorus, and potassium as the three most important elements for plant nutrition. Of secondary importance are sulfur, magnesium and calcium. Fertilizers are used for two main purposes: 

1. Working as additives to provide nutrients to plants. 

2. To enhance the soil’s effectiveness at water retention and soil aeration. 

Agro fertilizers can be applied to plants both as solids and liquids; liquid nitrogen fertilizer is a popular example of the latter, often used with other water-soluble agriculture fertilizers, for its quick and effective absorption. Almost 90% of fertilizers are commercially sold in powdered or granulated form. These agriculture fertilizers are available from fertilizer suppliers as concentrates and can be diluted using water to make them soluble for easier coverage and quicker absorption. Liquid fertilizers consist of anhydrous ammonia, aqueous ammonium nitrate solutions or urea.


LIST OF COMMON AGRICULTURE FERTILIZERS

For successful farming, agriculturists need to know about different fertilizers and their uses. The following agro fertilizers are popularly used across the industry:

Urea: The most widely used solid nitrogen fertilizer, urea is distributed in granulated form. It can also be mixed with ammonium nitrate and dissolved in water to form urea ammonium nitrate solution. Urea reacts with water to form ammonia, which makes the nitrogen within the fertilizer available to the plant. Urea fertilizers deliver the highest amounts of nitrogen – about 46%, and is therefore the most popular agriculture fertilizer in use. 

Ammonium nitrate is an agro fertilizer typically available from fertilizer suppliers in granular form, ammonium nitrate also provides a substantial amount of nitrogen to the soil. Most useful across specialty crops, like citrus fruits, and for fertilization across grass land for animal pasture, ammonium nitrate provides an approximate 33% nitrogen. 

Ammonium sulfate is usually sold by commercial fertilizer suppliers as a solid. Ammonium sulfate is formed as a by-product from the waste generated by coke ovens when sulfuric acid is used to remove ammonia from coal. It delivers 21% nitrogen to a plant.

Calcium nitrate contains 16% nitrogen in a nitrate form. Though less effective than other nitrogen fertilizers due to leaching when applied to soil, calcium nitrate is used in large numbers across fruit and vegetable crops, as it provides an easily-soluble source of calcium to calcium-deficient soils.  

Diammonium phosphate is a commercially-produced fertilizer that can provide up to 46% of phosphorous to a plant. In addition, the ammonia component of diammonium phosphate also delivers around 18% nitrogen. A highly-water soluble compound, diammonium phosphate is often applied to crops in liquid form.

Monoammonium phosphate is a phosphorous-heavy agriculture fertilizer that delivers slightly more phosphorus than diammonium phosphate – at approximately 48%. The amount of nitrogen though, provided through this fertilizer is somewhat less at 11%. This agriculture fertilizer is popular at the germinating stage of a crop cycle as the lower ammonia component lessens the risk of damage, when applied to new seedlings.

Triple super phosphate is often combined with nitrogen-based fertilizers to provide a better, broad-spectrum application. Available from fertilizer suppliers in granular form, triple super phosphate is spread directly on to the soil. While largely replaced by diammonium phosphate and monoammonium phosphate due to their easier storage requirements, and the availability of nitrogen within the chemicals, triple super phosphate is still in use, both commercially, and across smaller home agricultural applications.

Potassium nitrate also called nitrate of potash, is popularly used across vegetable crops including celery, potatoes, leafy green vegetables, tomatoes and several fruit crops. The nitrate components of this chemical fertilizer work well to support these crops through their growth. Potassium nitrate provides 44% potassium to crops. 

Potassium chloride, sometimes called muriate of potash, is a significant source of potassium in agriculture fertilizers.  Applied directly to soil, or combined with other mineral-based fertilizers, potassium chloride is also a highly soluble compound. It is often mixed with liquid nitrogen fertilizers before application, to provide 60 to 62% potassium to plants. 


APPLICATION METHODS OF AGRO FERTILIZERS

Fertilizers are applied across all growing crops, either at the seedling stage or at some point in the plant cycle. Their usage is largely dependent on the kind of crop being cultivated and the fertility of the soil (determined through a soil test). Legumes for example, as mentioned earlier, pull nitrogen from the air around them, and generally do not require additional solid or liquid nitrogen fertilizer. 

Slow vs controlled-release fertilizers: The use of chemical agriculture fertilizers across crops calls into question the effects of biochemicals not only on the plant at different stages in its growth cycle, but also on the soil and its surrounding environment. While the market share of the slow- and controlled-release fertilizer suppliers remains relatively low, they offer benefits by reducing impact on the environment and on the contamination of subsurface water. Slow-release fertilizers also have the added advantage of reducing the ‘burning’ effect of excess nitrogen on plants. The polymer coating around this kind of agriculture fertilizer gives the solid tablets and spikes a staged, nutrient-release timeline as the shell encapsulating the mineral components and plant nutrients degrades at a specified rate. Sulphur is used as a typical encapsulation material, while thermoplastics are used in the diffusion-controlled release of urea. 

Foliar application:

This is when fertilizers are applied directly to the leaves of a plant. Used almost universally to apply water-soluble, as well as liquid nitrogen fertilizers, this kind of application method is most popular across high-value crops like fruits, vegetables and nuts. Its usage however, is gaining increasing popularity due to its many advantages. 

Solid vs Liquid Fertilizer:

About 90% of fertilizers are applied in solid form, where the most widely-used chemical fertilizers are urea, diammonium phosphate and potassium chloride. Typically granulated or powdered, solid agricultural fertilizers are available as ‘prills’ – a solid globule. Liquid fertilizers comprise of anhydrous ammonia, aqueous solutions of ammonia, aqueous solutions of ammonium nitrate or urea. Commercially available in concentrated form, they can be diluted with water to form a desirable consistency for particular crops or added to the irrigation water (fertigation) for quicker absorption and wider coverage. 


ADVANTAGES & DISADVANTAGES OF GRANULAR VS LIQUID FERTILIZERS

Granular Agriculture Fertilizers

Advantages:

Easier to store.

Slow-release granules help feed crops longer into the season.

More efficient for pre-plant application (example: increase fertility of soil before plantation).

Disadvantages:

High salt content can burn leaves and steer roots away from nutrients.

Immobile nutrients such as phosphorus can’t get close to the roots because they can’t be carried in liquid-form through water.

Each granule holds a nonuniform amount of nutrients.

Liquid Agriculture Fertilizers

Advantages

Easy to use and engineered to deliver nutrition when the plant needs it.

Plants grow faster, increasing the yield.

Easy to handle when blending and applying. Mixes well with other soluble agriculture fertilizers and herbicides.

Provides uniform application.

Can be used for both start (seedling) and in-season (growth) applications.

Used popularly and to great advantage across specialty crops like fruits, vegetables and nuts.

Diverse usage options across in-furrow, or through foliar applications.

Deliverable directly through an irrigation system.

Cheaper, safer application directly to seeds and leaves.

Usable in smaller amounts, delivering specific, quantifiable nutrition to a plant, which helps the soil and the environment, by limiting the polluting effects of chemical compounds through environmental run off and soil leaching. 

Stops overfertilization by delivering smaller amounts that do not cause fertilizer burn.

Disadvantages:

Needs to be carefully stored. Can be expensive to convert equipment to handle liquid fertilizer

More susceptible to volatilization and loss.


USES & EFFICIENCY OF LIQUID NITROGEN FERTILIZER 

Liquid nitrogen fertilizers are generally cheaper than its granulated, solid version (ammonium nitrate) because of lower industrial production costs. Although highly corrosive if not stored properly within specially-built vats, the handling, usage and efficiency of liquid nitrogen fertilizers with other soluble fertilizers makes it not only safe, but also very versatile. 

Commercially-available liquid nitrogen fertilizer contains approximately 39% nitrogen, which amounts to more than granulated ammonium nitrate, which offers only 27% nitrogen. Liquid nitrogen fertilizer is also generally considered to be safer to animals grazing on grassland sprayed with it. Grassland, as well as crops, have minimal to no scorching from burning, while sprayed with liquid nitrogen fertilizer, especially if used with a little dilution and delivered through low pressure. 

Liquid nitrogen fertilizer also delivers with accuracy – particularly on the headlands/ peninsulas. With land that is not uniform, it is virtually impossible to evenly spread granular fertilizer as granules can fall in concentrated numbers into ditches and soil troughs, damaging plants.

Flowing evenly through a single-manned automated sprayer, liquid nitrogen fertilizer application also helps reduce labor costs and hours. It can also be applied to plants through wet or windy conditions.

Liquid Nitrogen Fertilizer use across grassland:  Fertilization, especially with nitrogen, represents the biggest, single cost in grass production for animal grazing. However, as liquid nitrogen fertilizers can be commercially produced at lower prices than granulated nitrogen fertilizers, the price per unit of nitrogen to the farmer, is also lower. Equally, liquid nitrogen fertilizers uniformly distribute nutrients across a field, allowing farmers to work across larger grazing areas. 


AGRI – A 40-YEAR OLD FARMING AND AGRICULTURAL SUPPLIER

Agri is one of Saudi Arabia’s leading suppliers of agricultural products. A part of the ABT Group, Agri is one of the oldest and best-known agricultural trading houses in the region. The company has been a pioneer in providing agricultural distribution across the region – enabling growth and prosperity for farmers in the Kingdom. 

Working with top-quality international and local brands, the company strives to provide the best agricultural fertilizer products, that are readily available and competitively priced. 

Agri provides a wide range of agro fertilizer products, which include: 

Linah Fertilizer is specially formulated keeping in mind the nutritional requirements of date palms. The potassium-rich formulation improves growth, tree health and fruit yield.

Agrisole, water-soluble fertilizers contain nitrogen, phosphorous and potassium compounds that have wide application and usage across many plants and crops. The special formula for Agrisole delivers on measured uptake, improved absorption and healthy plant growth. 

HumiXtract Fertilizer is an organic agriculture fertilizer that slow-releases nutrients, while improving soil structure and its ability to hold water. HumiXtract’s slow-release formula prevents over-fertilization and eliminates the risk of toxic buildups of salts and chemicals. Biodegradable, sustainable and environmentally-friendly, HumiXtract delivers on long-term crop health and soil viability.

To learn more about best-use agricultural fertilizers and fertilizer applications, Agri products and services, or to see how the company can help you achieve your goals, click here.