Fertilizer types and Categories in Agriculture
Fertilizers are substances added to the soil or applied to plants to supply essential nutrients required for their growth, development, and productivity. They help improve soil fertility, promote healthy plant growth, and increase the quantity and quality of agricultural produce.
However, Plant requires total 17 nutrients which are classifies as non-mineral nutrients and Mineral nutrients. Non-mineral nutrients and Primary nutrient are required in relatively large amounts, secondary nutrients moderate amounts but less than NPK more than micronutrients which are needed in very small quantities, but they play important roles in various physiological and biochemical activities.
- Non-Mineral (3): Carbon (C), Hydrogen (H), Oxygen (O) — absorbed from air and water.
- Primary Macronutrients (3): Nitrogen (N), Phosphorus (P), Potassium (K) — needed in large amounts.
- Secondary Macro nutrients (3): Calcium (Ca), Magnesium (Mg), Sulfur (S) — needed in moderate amounts.
- Micronutrients / Trace Elements (8): Iron (Fe), Manganese (Mn), Zinc (Zn), Copper (Cu), Boron (B), Molybdenum (Mo), Chlorine (Cl), and Nickel (Ni).
Fertilizers are classified into different types based on their source, nutrient composition, and physical form. Based on their source, they are classified as organic fertilizers, inorganic fertilizers, and biofertilizers. Based on nutrient composition, they are categorized as straight fertilizers, complex fertilizers and micronutrient fertilizers. Based on their physical form, fertilizers are classified as solid, liquid, and gaseous fertilizers. This classification helps in understanding the characteristics, uses, and appropriate application methods of different fertilizers in agriculture.
- Non-mineral elements
- Straight fertilizers.
- Complex fertilizers.
- Fortified fertilizer.
- Secondary Nutrient fertilizers.
- Organic Fertilizers.
- Bio-Fertilizers.
- Micronutrients.
- Organo Mineral Fertilizer.
- Water-Soluble Fertilizers.
- De-Oiled Cakes.
- Bio-Stimulants.
- Nano Fertilizers.
- Liquid Fertilizers.
- Beneficial Nutrients.
Non-mineral elements: Plants require various elements for their growth and development. Among these, carbon (C), hydrogen (H), and oxygen (O) are known as non-mineral elements because plants obtain them mainly from air and water rather than from soil minerals. Together, these three elements account for approximately 95–96% of a plant’s dry weight. Carbon is obtained mainly from atmospheric carbon dioxide, while hydrogen is obtained from water absorbed by the roots. Oxygen is obtained from both carbon dioxide and water. These elements are essential for photosynthesis and form the basic structural components of carbohydrates, cellulose, proteins, and other organic compounds necessary for plant growth and development.
Straight fertilizers: These fertilizers mainly supply one primary nutrient They are designed to supply nitrogen(N), phosphorus(P), or potassium(K) individually, depending on the crop’s specific needs. Because they are simple in composition, straight fertilizers are often used when soil testing reveals a clear nutrient deficiency. These fertilizers are especially useful when you want precise control over nutrient application. For example, if a field lacks nitrogen but already has sufficient phosphorus and potassium, a straight nitrogen fertilizer can correct the deficiency without adding unnecessary nutrients. They can be applied through soil amendments depending on the nutrient requirement, crop type, and growth stage.
Stright fertilizers can be applied through soil application methods such as placement, side-dressing, top-dressing, and broadcasting, depending on the nutrient requirements, crop type, soil conditions, and growth stage. These methods help ensure efficient nutrient availability, healthy plant growth, and improved crop yield
Complex Fertilizers
Complex fertilizers contain two or more primary nutrients in a single granule or product. Unlike straight fertilizers, which supply a single primary nutrient, complex fertilizers provide multiple nutrients in one application. They are widely used in modern agriculture because they simplify nutrient management, save labor, and promote uniform nutrient distribution.
Examples of complex fertilizers include:
- NPK fertilizers: Supply nitrogen (N), phosphorus (P), and potassium (K).
- NP fertilizers: Supply nitrogen (N) and phosphorus (P).
- PK fertilizers: Supply phosphorus (P) and potassium (K).
Complex fertilizers are particularly useful when crops require multiple primary nutrients or when farmers want to distribute nutrients uniformly across the field. The appropriate fertilizer grade depends on the crop, soil fertility, and growth stage.
Complex fertilizers can be applied through soil application methods such as placement, side-dressing, top-dressing, and broadcasting, depending on the nutrient requirements, crop type, soil conditions, and growth stage. These methods help ensure efficient nutrient availability, healthy plant growth, and improved crop yield
Fortified Fertilizers
Fortified fertilizers combine essential primary nutrients with additional micronutrient(s) or other beneficial nutrients to improve plant health, nutrient uptake, and soil fertility. Their enriched composition helps correct nutrient deficiencies, stimulate root development, and enhance crop tolerance to environmental stress. By promoting balanced nutrition, consistent crop growth, and improved plant performance, fortified fertilizers support healthier crops and better yield outcomes across diverse cultivation systems.
Examples of Fortified fertilizers include
- Potash Fortified with Silicon
- Boron-Fortified Superphosphate
- Zinc-Fortified DAP
- Boron-Fortified Superphosphate
- Neem-Coated Urea
They can be applied through soil amendments depending on the nutrient requirement, crop type, and growth stage.
Secondary Nutrient Fertilizers
Secondary nutrient fertilizers supply calcium (Ca), magnesium (Mg), and sulfur (S), which plants need in moderate amounts more than micronutrients, but less than primary macronutrients like nitrogen, phosphorus, and potassium (NPK). Calcium supports root growth and strengthens cell walls, magnesium plays an important role in photosynthesis, and sulfur helps in protein formation. These fertilizers promote healthy plant growth, improve crop yield, and help maintain soil fertility.
They can be applied through soil amendments, fertigation, or foliar sprays, depending on the nutrient requirement, crop type, and growth stage.
Organic fertilizers
Organic fertilizers are natural substances derived from plant residues, animal wastes, and other biodegradable materials that are used to supply essential nutrients to plants and improve soil fertility. They play an important role in sustainable agriculture by enhancing soil structure, increasing organic matter content, and supporting beneficial soil microorganisms. Common examples of organic fertilizers include farmyard manure, compost, vermicompost, poultry manure, neem cake, and oil cakes.
Organic fertilizers release nutrients gradually through the decomposition of organic materials by soil microorganisms. This process helps supply essential 14 nutrients such as nitrogen, phosphorus, and potassium which are necessary for plant growth and development. In addition to providing nutrients, organic fertilizers improve soil aeration, water-holding capacity, and overall soil health.
The use of organic fertilizers can reduce dependence on chemical fertilizers, promote environmentally friendly farming practices, and support long-term agricultural productivity. Proper selection, dosage, and application of organic fertilizers are essential to obtain better crop growth, maintain soil fertility, and achieve sustainable agricultural production.
They can be applied through soil amendments, fertigation, or foliar sprays, depending on the nutrient requirement, crop type, and growth stage.
Bio-fertilizers
Bio-fertilizers are natural, eco-friendly substances containing living microorganisms (such as bacteria, fungi, and algae) that improve soil fertility and help plants absorb essential nutrients. Unlike chemical fertilizers that feed the plant directly, bio-fertilizers act as a living system to unlock and mobilize nutrients already trapped in the soil. Biofertilizers are products containing beneficial microorganisms that improve soil fertility and promote healthy plant growth. They work by fixing atmospheric nitrogen, making nutrients such as phosphorus and zinc available to plants, increasing root growth and water absorption through mycorrhizal fungi, and producing natural plant growth hormones.
Methods of Biofertilizer Application
- Seed Treatment: Treat seeds with the recommended biofertilizer before sowing.
- Root-Dip Application: Dip the roots of seedlings in a biofertilizer suspension before transplanting.
- Soil Application: Mix the recommended biofertilizer with well-decomposed farmyard manure (FYM) or compost. Broadcast the mixture evenly over the field during final land preparation.
Micronutrients
Plants require eight essential 8 micronutrients for their proper growth and development. These nutrients are needed in very small quantities, but they play important roles in plnat life cycle. A deficiency of any of these micronutrients can adversely affect plant growth, crop yield, and produce quality.
Micronutrients such as Boron (B), Copper (Cu), Iron (Fe), Manganese (Mn), Molybdenum (Mo), Zinc (Zn), Chlorine (Cl), and Nickel (Ni) are essential for healthy plant growth, enzyme activity, photosynthesis, nutrient metabolism, enzyme activation, nutrient metabolism, reproductive development and fruity quality. They can be supplied through soil application, fertigation, or foliar sprays, depending on soil conditions, crop requirements, nutrient availability, and the plant’s growth stage. The appropriate source, dose, and application method should be selected based on soil or plant-tissue testing to prevent deficiencies and avoid micronutrient toxicity.
However, chlorine (Cl) and nickel (Ni) are also essential micronutrients required by plants in very small (trace) quantities to complete their life cycles.
Organo-mineral fertilizer (OMF)
Organo-mineral fertilizers are a hybrid agricultural product that combines organic carbon and matter (such as compost, animal manure, or humic substances) blended with a specific nutrient such as Nitrogen (N), Phosphorus (P), Potassium (K), Calcium (Ca), Magnesium (Mg), Sulphur (S), Iron (Fe), Manganese (Mn), Zinc (Zn), Copper (Cu), Boron (B), Molybdenum (Mo), Silicon (Si) into a single, uniform granule or mixture.
They deliver both an immediate boost from the mineral component and a steady, slow-release supply of nutrients from the organic fraction. The use of organomineral fertilizers is extremely important for soil fertility, plant health and yield. This type of fertilizer is very rich in mineral varieties dosed with organic matter. Organo mineral fertilizers have popularity in other countries not in india and they are now part of plant nutrition programs in all cultivation activities.
They can be supplied through soil application, fertigation, or foliar sprays, depending on soil conditions, crop requirements, nutrient availability, and the plant’s growth stage. The appropriate source, dose, and application method should be selected based on soil or plant-tissue testing to prevent deficiencies and avoid micronutrient toxicity.
Water-soluble fertilizers
Water-soluble fertilizers (WSFs) are specialized fertilizers that dissolve readily in water and supply essential nutrients to plants. They contain primary macronutrients such as nitrogen (N), phosphorus (P), and potassium (K), along with secondary nutrients and micronutrients. WSFs are commonly applied through fertigation and foliar spraying to improve nutrient availability, plant growth, crop yield, and produce quality. They play an important role in modern agriculture by promoting efficient nutrient management and sustainable crop production
Water-Soluble Fertilizers (WSFs) are widely used in modern agriculture, especially in precision farming, greenhouses, horticulture, and high-value crops. They are mainly applied through fertigation, where fertilizers are mixed with irrigation water, and foliar spraying, where nutrient solutions are sprayed directly onto plant leaves. These methods help supply nutrients evenly and correct nutrient deficiencies quickly.
Note: High-quality WSFs are designed to dissolve completely under the specified conditions, leaving minimal insoluble residue. However, solubility depends on the fertilizer formulation and water quality.
De-Oiled Cake (DOC)
De-Oiled Cake (DOC) is a nutrient-rich organic fertilizer obtained as a by-product of oil extraction from oilseeds such as neem, castor, mustard, and rapeseed. It is widely used in sustainable agriculture to improve soil fertility, enhance soil structure, and support healthy plant growth. Neem DOC and Castor DOC are particularly valued for their organic matter and nutrient content, which help improve nutrient availability and promote beneficial microbial activity in the soil. By supporting better root development, improving soil aeration, and enhancing nutrient uptake, DOC contributes to healthier crops, improved soil health, and sustainable agricultural productivity. It is an excellent choice for farmers seeking to improve crop quality and maintain long-term soil fertility through organic farming practices.
Bio-Stimulants
Bio stimulants are substances or microorganisms that enhance plant growth, nutrient uptake, nutrient-use efficiency, crop quality, and tolerance to environmental stresses such as heat and drought. Biostimulants are a recent innovation that introduces new sustainable opportunities for crop production.
Modern agriculture faces challenges such as declining soil fertility, climate change, drought, and inefficient nutrient utilization. Biostimulants are substances or microorganisms that stimulate natural plant processes to improve growth, nutrient uptake, nutrient-use efficiency, crop quality, and tolerance to environmental stresses. Unlike fertilizers, which supply essential nutrients, biostimulants enhance the plant’s ability to utilize available resources effectively
Biostimulants are known as crop enhancers because they stimulate the plant’s natural processes rather than simply supplying nutrients. By supporting root development, nutrient-use efficiency, and plant stress responses, they help optimize crop performance and contribute to more sustainable agricultural production.
Crop enhancers (Bio Stimulnats) can be supplied through soil application, fertigation, or foliar sprays, depending conditions, crop requirements and the crop stage.
Nano Fertilizers
Nano fertilizers are nutrients that are encapsulated or coated within nanomaterial in order to enable controlled release, and its subsequent slow diffusion into the soil.Nano fertilizers are a type of fertilizer that uses nanotechnology to enhance the efficiency and effectiveness of nutrients in agricultural production. The basic concept behind nano fertilizers is the use of nano-sized particles (typically 1 to 100 nanometers in size) to deliver nutrients to plants more effectively. These particles are small enough to penetrate plant cells, allowing for better absorption and more targeted delivery of essential nutrients like nitrogen, phosphorus, and potassium.
Unlike traditional fertilizers, which often lead to nutrient leaching or overuse, nano fertilizers are designed to release nutrients gradually, ensuring that crops get the right amount of nutrition at the right time. This technology enhances the bioavailability of nutrients, making them more accessible to plants and improving overall crop health and yield
The key to the effectiveness of nano fertilizers lies in their size and composition. Traditional fertilizers often require a large amount of nutrients to be absorbed by the soil, and much of these nutrients can end up being washed away by rain or irrigation. Nano fertilizers, however, use nano-particles that are easier for plants to absorb, reducing the need for large quantities of nutrients. The small size also ensures that nutrients are available to the plant roots over a longer period, eliminating the risk of nutrient wastage.
Furthermore, nano fertilizers can be engineered to release nutrients in a controlled manner, allowing for slow-release fertilization. This slow-release feature ensures that the nutrients are available to plants throughout their growing season, reducing the need for frequent applications.
Liquid Fertilizers
Liquid fertilizers are fertilizers supplied in liquid form to help plants get essential nutrients such as nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), and sulphur(S), Boron (B), Copper (Cu), Iron (Fe), Manganese (Mn), Molybdenum (Mo), and Zinc (Zn).They are widely used in agriculture for crops such as cotton, chilli, paddy, maize, groundnut, vegetables, and fruit crops. Liquid fertilizer for plants is a nutrient-packed solution, applied to the leaves (foliar application) or to the soil near the root zone. Most notably, liquid fertilizers are used for fast absorption and quick results. Liquid fertilizers can be a viable option when crops require immediate nutrition, an attribute that is distinct from granular fertilizers.
Liquid fertilizers are an important component of modern agriculture because they provide convenient application, uniform nutrient distribution, and rapid nutrient availability when used appropriately. They can be applied through foliar spraying, soil application, or fertigation systems, allowing farmers to supply essential nutrients according to crop requirements and growth stages. Compared with conventional granular fertilizers, liquid fertilizers offer greater flexibility in application and can support efficient nutrient management.
Different types of liquid fertilizers are formulated to supply specific nutrients, including nitrogen, phosphorus, potassium, and essential micronutrients. Selecting the right fertilizer based on soil conditions, crop type, and growth stage helps correct nutrient deficiencies, promote healthy plant development, improve flowering and fruit formation, and enhance crop productivity.
Beneficial Nutrients
Beneficial nutrients (or beneficial elements) are non-essential elements that are not required by all plants to complete their life cycle, but they stimulate growth, improve stress tolerance, or enhance metabolic efficiency in specific plant species.
Silicon (Si) strengthens plant tissues and improves resistance to drought and diseases, sodium (Na) helps maintain water balance and supports growth in certain plants, while cobalt (Co) supports nitrogen fixation in legumes. These elements improve plant health and productivity under specific conditions.
Our Commitment
At Agrience, we believe that every crop has a nutritional need, every farmer has a preferred application method, and every field deserves a suitable nutrition solution. Our approach brings together diverse nutrient sources, advanced formulation technologies, and flexible application options to support productive farming, balanced crop nutrition, and sustainable agricultural practices.
