What are fertilizers and manures?
Manure and fertilizers are fundamental terms in plant nutrition and, although they are often confused, they have notable differences both in their composition as in his enforcement and effects on soil and plants.
The objective of both products is enrich the land Providing essential nutrients that promote crop development. However, their origins, modes of action, presentation, and impact on the ecosystem distinguish them, and this is essential for more efficient and sustainable agricultural, gardening, and orchard management.
Fundamental differences between manure and fertilizer
Both perform the function of improving soil fertility and providing nutrients to plants, but Their differences are centered on the origin, composition, speed of action and environmental impact:
- Origin: The Fertilizers They come mainly from organic sources and natural, such as plant and animal remains; fertilizers usually of chemical, mineral or synthetic origin, although there are manufactured organic fertilizers.
- Composition:: Compost is more complete in micronutrients, organic matter, and beneficial microorganisms. Fertilizer is composed of specific macro- and micronutrients (nitrogen, phosphorus, potassium, among others) in defined concentrations and can be tailored to specific needs.
- Speed of action: Fertilizers release nutrients from slow and progressive form as they decompose in the soil. Fertilizers usually have an action faster and more targeted, which is why they are used when there are specific deficiencies or immediate requirements.
- Environmental impact: Compost, being natural, improves soil structure and minimizes the risk of contamination. Chemical fertilizers, if used excessively, can acidify the soil, contaminate groundwater, and affect soil biology.
Fertilizers: types, advantages and uses
The Fertilizers They are defined as materials of plant or animal origin that are added to the soil in order to increase its nutrients, improve its structure and enhance biological activityThey are the basis of natural fertility and can be classified into several categories:
- Manure: It comes from herbivorous animals (cows, horses, sheep, chickens). It is rich in organic matter and nutrients such as nitrogen, phosphorus, potassium, calcium, and magnesium. It is essential to apply well-cured or composted manure to prevent the presence of pathogens and weed seeds.
- Compost: Product of the aerobic decomposition of domestic, agricultural, and plant waste. Contains a high level of microbial diversity and important micronutrients.
- Chicken Manure and GuanoChicken manure is the excrement of chickens, highly concentrated in nutrients such as sulfur, calcium, and phosphorus. Guano, from seabirds or bats, is one of the most complete and valuable fertilizers due to its high nitrogen, phosphorus, and potassium content.
- Earthworm humus: Also known as vermicompost. It results from the digestion process of organic matter by worms, especially eisenia foetida, producing an extremely rich fertilizer that is easily assimilated by plants. It promotes rooting, improves soil structure, and protects against pathogens.
- green manures: This involves planting fast-growing plant species (legumes, grasses, cruciferous vegetables) and, before they reach full flowering, cutting them and incorporating them into the soil as fresh organic matter. They fix nitrogen, improve structure, prevent erosion, and slowly provide nutrients.
- Bocashi: Fermented fertilizer made from chicken manure, rice husks, sifted soil, charcoal, molasses and other ingredients, accelerating decomposition and strengthening the soil.
In addition to these, many gardens use kitchen scraps, dried leaves, coffee grounds, and vegetable mowing waste to enrich their compost, closing the nutrient cycle.
Advantages of using fertilizers
- They favor the soil structure by increasing its porosity, water retention capacity and aeration.
- They promote microbial biodiversity, essential for healthy plant growth.
- They reduce dependence on chemicals and contribute to more sustainable agriculture.
- They increase the organic matter content and nutrient retention over time.
Fertilizers: types, applications and characteristics
The fertilizers They are products formulated for provide specific nutrients plants, ensuring that they have all the essential elements at the right time and in the right quantity. They can be categorized according to their origin, composition, and mode of action:
- Inorganic or chemical fertilizers: These are industrially manufactured mineral salts that contain essential nutrients (nitrogen, phosphorus, potassium – NPK) and, occasionally, micronutrients (magnesium, calcium, boron, zinc, iron, etc.). They are available in soluble, fast-release, controlled-release, granulated, or liquid forms.
- Organic fertilizersAlthough the term "fertilizer" is often associated with synthetic products, there are also manufactured organic fertilizers, such as seaweed extracts, plant slurries (comfrey slurry, nettle slurry, etc.), and liquid compost preparations. You can complement their use with natural fertilization techniques to enhance results, as in promote the use of homemade organic fertilizers.
- Simple and compound fertilizers: The former contain a single nutrient (e.g., urea for nitrogen), while the latter combine several nutrients (NPK) in proportions adapted to different types of plants and crops.
Types of fertilizers according to the plant or requirement
- For cacti and succulents: Low nitrogen content and high potassium and magnesium content to prevent excessive growth and ensure tissue strength.
- For flowering plants: High concentration of nitrogen and potassium to stimulate flowering and leaf development.
- For palm trees and acidophilic trees: Specific proportions of NPK and micronutrients adjusted to the needs of these species (for example, 7-3-6 for palm trees and 6-5-8 for acidophilic ones, accompanied by iron in the case of the latter).
- For bonsai: Low doses and specific ratios of nutrients, avoiding excesses to avoid altering the balance of plants in small pots.
Advantages and risks of fertilizers
- They allow precise control on the doses and application times, adjusting the contributions to the physiological stage and plant species.
- Immediate correction of nutritional deficiencies, essential for high-yield crops or potted plants where nutrient reserves are limited.
- Possible environmental contamination: Improper or excessive use can accelerate nutrient leaching, contaminate groundwater and rivers, alter pH and reduce the biological fertility of the soil.
- They lack organic matter and therefore do not improve the structure or life of the soil.
Composition and labeling: NPK and beyond
The label of any fertilizer shows the richness in main nutrients, expressed with three numbers that correspond to:
- N: Nitrogen (vegetative development, leaves and stems)
- P: Phosphorus (root development, flowering and fruit)
- K: Potassium (protection against diseases and stress, fruit quality and climate resistance)
Fertilizers can also provide micronutrients and supplements such as iron, magnesium, calcium, zinc, sulfur, or boron, depending on the plant's needs. For the best choice, we recommend consulting our fertilizer guide.
In the Fertilizers, the composition is more heterogeneous, being determined by its origin and composting process, but they always contribute to the overall enrichment and microbial activity.
Application methods and practical recommendations
La way to apply fertilizers and manures It varies depending on the product, the crop, and the condition of the soil or substrate. Here are the most important recommendations:
- solid fertilizers: They are scattered on the soil, mixed into the substrate, or buried in areas near the roots before sowing or transplanting. Nutrient release is slow and gradual, ideal for long-term crops and home gardens.
- Liquid fertilizers or compost tea: They are applied through irrigation for a faster effect, promoting microbial colonization and nutrient assimilation in critical phases of the crop.
- Chemical fertilizers: They are usually diluted in irrigation water according to the manufacturer's instructions and applied during the active growth phase. It is crucial to adhere to the dosages to avoid overfertilization, toxicity, and root damage.
- Application maximsThe frequency and exact timing depend on the species, vegetative stage, climate, and product composition. Some demanding plants require frequent fertilization, while others thrive with a single spring fertilization. It's always vital to consult the plant's technical specifications and the needs of each plant.
A big common mistake is to over-fertilize or apply excess fertilizer thinking that the plants will grow faster, when in fact it can actually increase the susceptibility to diseases, foliar burns o bad developments.
Manures and fertilizers: combined benefits and ecological practices
The current trend, both in professional agriculture and in horticulture or domestic gardening, is combine organic fertilizers with fertilizers to get the best of both worlds:
- Organic fertilizer It improves soil structure and life, provides organic matter and releases nutrients slowly, maintaining long-term fertility.
- Fertilizer corrects specific deficiencies and ensures critical nutrients when the plant's development requires it.
This combination, accompanied by periodic soil analysis and attention to the phases of the plant cycle, results in healthier, more sustainable, and more productive crops.
Environmental impacts and sustainability
Responsible use of fertilizers and manures is essential for the conservation of the environment:
- Natural and organic fertilizers They reduce the ecological footprint, prevent water pollution and promote microbial biodiversity.
- Chemical fertilizersIf used uncontrolled, they can alter pH, salinize the soil and cause diffuse pollution and eutrophication of water bodies, damaging ecosystems and endangering human and animal health.
- Organic and regenerative agriculture prioritizes the use of fertilizers and composting techniques, rotations, and cover crops, reserving the use of industrial fertilizers only for cases where it is not possible to meet needs otherwise.
The balance between both products is key to maintaining agricultural productivity and protecting the natural environment.
Mistakes and recommendations when choosing fertilizer
Choosing the right type of fertilizer is essential to the success of any planting:
- Not all crops require the same thing: Always determine the particular nutritional needs of each species or variety.
- Avoid the exclusive use of chemical fertilizers in the long term, as they impoverish the soil and can cause dependency and imbalances.
- The use of fresh fertilizers (such as freshly dug manure) can be hazardous due to pathogens or poor decomposition. Always opt for pre-composting.
- Read the label and follow the manufacturer's instructions. to avoid overdoses and collateral damage.
- Take into account the vegetative cycle of your plants and their requirements at each stage (germination, growth, flowering, fruiting, dormancy).
Frequently asked questions about fertilizers and manures
- Can compost and fertilizer be used together? Yes, in fact, it's the best option: compost improves the soil and provides long-term nutrients, while fertilizer meets specific or one-off needs.
- When should I apply one or the other? Compost is usually applied when preparing the soil, in autumn or spring, and fertilizer is applied during specific growth stages or shortages.
- Which fertilizer is best for each plant? It depends on the species, but compost and worm castings are suitable for most crops, manure for high-requirement crops, and green manures for renewing the soil between harvests.
- What are the risks of over-fertilization? Root damage, leaf burn, nutrient imbalance, loss of beneficial microorganisms, environmental contamination, and reduced crop quality.
- Can fertilizers be organic? Yes, if they come from certified organic sources or are obtained through natural processes, such as seaweed extracts, liquid compost, etc.
- What is the difference between fertilizer and nutrient? Fertilizer is a product that provides nutrients. Nutrients are the elements that a plant needs to grow.
