Hydroponic farming: What it is, how it works, advantages, disadvantages, and productivity

Hydroponic cultivation has established itself as one of the more innovative and effective alternatives in agricultural productionIts ability to eliminate soil dependence and optimize resources such as water, nutrients, and space makes it a widely adopted method in both industrial agriculture and urban gardens and home projects. In this article, you'll find a detailed explanation of What is hydroponic cultivation, its types, advantages, disadvantages, applications and recommendations for those looking to get started or go deeper into this technique.

What is hydroponic cultivation?

Hydroponic cultivation is a agricultural production technique based on the growth of plants without soilInstead, roots develop directly in aqueous solutions containing all the essential nutrients for plant growth. This method uses various inert supports or substrates (such as perlite, rock wool, expanded clay, peat, vermiculite, among others) that provide stability to the plants, while nutritional support is provided through the circulation of water enriched with minerals and key elements such as nitrogen, potassium, phosphorus, calcium, magnesium, iron, and zinc.

Hydroponics has been studied for centuries, but today, thanks to automation technologies, environmental control and artificial lighting, has become a key response to the scarcity of fertile soil, space limitations and growing global food demand, allowing the Efficient cultivation in urban environments, greenhouses and even indoors.

How does the hydroponic system work?

The basic principle of the Hydroponics It consists of supplying plants with water containing the necessary mineral salts, precisely adjusting the concentration of each element so that the plant has everything it needs at each stage of development. This is achieved through automated circulation and recirculation systems for nutrient solutions that can be managed manually or with specific technology.

To provide physical support, porous and inert materials are used. They do not act as a source of nutrients but do ensure oxygenation and stability of the roots. Among the most popular are:

• Perlite
• Rock wool
• Expanded clay
• Peat
• Vermiculite

Each hydroponic system can be adapted depending on the species grown, the available space, and the grower's budget.

Main types of hydroponic systems

Hydroponics is versatile and offers several different variations, each with its own unique characteristics and recommended uses. The most common are:

1. NFT System (Nutrient Film Technique): It uses a thin film of nutrient solution that continuously circulates over the roots arranged in inclined channels. It is ideal for leafy vegetables such as lettuce y aromatic herbs and is characterized by its efficiency in the use of water and nutrients.
2. Floating root: Here, the plants are placed on foam or polystyrene trays, which float in tanks filled with the nutrient solution. Their roots are submerged and receive oxygen through air pumps. Widely used for short root vegetables.
3. Drip irrigation: One of the most widespread alternatives in industrial and domestic agriculture, where the solution is supplied directly to the roots through drippers, allowing detailed control of the supply.
4. AeroponicsIn this system, the roots are suspended in air within a closed compartment and sprayed with a nutrient mist. It promotes rapid growth and is ideal for plants of high commercial value and research crops.
5. Wick or wick: It is one of the simplest and most economical, using an absorbent wick to transfer the nutrient solution from a reservoir to the roots.
6. Ebb & Flow: This involves periodically flooding a container with nutrient solution, then allowing it to drain. This allows the roots to alternate between periods of moisture and oxygenation.

Each system can be adapted to specific needs, considering variables such as space, investment level, species to be cultivated, and user experience level.

Advantages of hydroponic growing

• Water saving and optimizationHydroponic systems significantly reduce water consumption (up to 90% compared to conventional irrigation) because the nutrient solution circulates and can be recycled, minimizing waste.
• Taking advantage of small and vertical spacesThe absence of soil and artificial support allow for intensive cultivation on terraces, roofs, balconies, and vertical structures in urban areas or areas with limited land. Vertical farming and innovative techniques for small spaces further facilitate production in urban areas.
• Crop production in controlled environmentsHydroponics allows for cultivation in all climates, compensating for the lack of fertile soil and enabling production in desert areas, greenhouses, or indoors.
• Accelerated growth and increased productivity: By providing optimal nutrients and conditions, plants spend less energy searching for resources and concentrate their development on producing leaves, fruits, and flowers, generating faster and larger harvests.
• Superior crop qualityNutritional control and the absence of soils minimize the risk of soil-borne diseases and pests, resulting in healthier, cleaner, and more consistent food.
• Reduction of herbicides and pesticidesBy not using soil, the appearance of weeds and typical soil pests is much less likely, avoiding the massive use of chemicals and improving environmental sustainability.
• Lower structural weightThe absence of soil makes hydroponic systems lightweight, making them easy to implement on roofs, shelves, and less durable surfaces.
• Reuse of solutions and nutrients: The recirculation of water and nutrients allows for highly efficient use of resources, reducing costs and the environmental impact associated with traditional agriculture.

Disadvantages and challenges of hydroponics

• Relatively high initial investmentStarting a hydroponic system requires materials, pumps, tubing, substrates, meters, and, in many cases, lighting and automation systems. While the long-term profitability is high, it's important to consider these initial costs. Grow cabinets and their usefulness in hydroponics can be a good option for small spaces.
• Need for constant supervisionHydroponics requires systematic attention to parameters such as nutrient concentration, pH, temperature, oxygenation, and water level, especially in the initial stages to avoid failures that could ruin the crop.
• Sensitivity to technical failures: Without the natural buffering of the soil, any disruption to the supply of water, nutrients, or energy can have an immediate and negative impact on plants.
• Requires knowledge and trainingTo ensure successful crops, it is necessary to educate yourself on plant nutrition, environmental monitoring, and hydroponic system management, as it is not as intuitive as traditional cultivation.
• Not suitable for all speciesWhile a wide range of vegetables and fruits can be grown hydroponically, there are limitations for species with deep roots, large fruit trees, or complex tubers such as potatoes and carrots.
• Dependence on electrical energyMany systems, especially automated ones, require a constant power supply to function properly (pumps, irrigation systems, artificial lighting), which can increase maintenance costs in certain regions.

Most appropriate and profitable crops in hydroponics

One of the strengths of hydroponic cultivation is its adaptability to a wide range of plants, especially those with short growth cycles, shallow roots, and high commercial demand. Highlights include:

• leafy vegetables: lettuce, spinach, chard, arugula and similar ones stand out for their rapid growth and ease of management.
• Aromatic herbs: basil, parsley, cilantro, mint, rosemary, thyme, sage and others.
• Small fruits: strawberries, raspberries, blueberries and, in highly developed systems, even small watermelons and melons.
• Fruit vegetables: tomatoes, cucumbers, peppers, eggplantSome require greater environmental control and adapted infrastructure.
• Grain: In experimental systems, it is possible to cultivate rice and wheat.
• Ornamental plants and tree seedlings: For decoration and controlled reforestation.

The choice of the appropriate crop will depend on market demand, the producer's knowledge, and the availability of space and resources.

• Lettuce, Red Lettuce: One of the most popular in hydroponics, it can be ready to harvest in 6 to 8 weeks, providing profitability and short production cycles.
• Spinach: Its development is rapid, achieving leaves ready for harvest in 3 to 4 weeks.
• Aromatic herbs: Like cilantro or basil, which can be ready in 3 to 6 weeks and allow for continuous harvests.
• Strawberries: They offer high quality and attractive prices, although they require special care.

Essential elements of a hydroponic system

• Structure: It can range from a simple root tray in water to sophisticated systems of channels and vertical supports.
• Inert substrate: Perlite, rock wool, expanded clay, among others, to stabilize the roots.
• nutrient solution: Water mixed with specific formulas for hydroponics, adjusting quantities and composition according to the crop.
• Irrigation and circulation system: Drippers, pumps, tubing, and timers to ensure constant flow and recycling of nutrients.
• Automotive Lighting : In indoor crops and climates with low sunlight, LEDs, metal halides, sodium lights or compact fluorescence are used.
• Environmental control: Thermometers, humidity sensors, pH meters and electrical conductivity meters to keep the system in optimal condition.

What differences exist compared to traditional cultivation?

The main difference lies in the absence of soil and direct control of nutrients In hydroponics. In conventional agriculture, plants depend on soil content and structure to absorb nutrients, which can lead to unevenness and variations in growth. In hydroponic systems, feeding is uniform and tailored to plant needs, optimizing yield, reducing disease, and minimizing the use of resources such as water, space, and fertilizers. In addition:

• The environment is more controlled: You can adjust temperature, lighting and humidity according to the needs of the crop.
• Greater efficiency in the use of resources: Less water, less fertilizer, and less space per kilo produced.
• Reduction of soil diseases and pests: Less risk of contamination from roots, fungi or nematodes.

Strategies to reduce costs and optimize hydroponics

One of the biggest attractions of hydroponics is the possibility of reuse water and nutrients. Implement water recirculation and recycling systems, along with disinfection through ozonation, UV rays or pasteurization, allows to reduce consumption, minimize environmental impact and keep crops free of pathogens.

If you can't afford a sophisticated recycling system, the water can be reused for other indoor or garden plants, avoiding landfill waste and promoting sustainability.

What can be grown in home hydroponics?

• Lettuce, spinach, arugula, chard: ideal for beginners, with short cycles and minimal space required.
• Aromatic herbs: parsley, cilantro, basil, mint, oregano, thyme.
• Cherry tomatoes: They require a little more space and support, but can be grown in home systems.
• Strawberries and some ornamentals: With proper care, they provide fresh fruit all year round and beauty to the environment.

Success in home hydroponics depends on the correct selection of planting density and substrate type, factors that directly affect yield and quality.

Critical success factors: density, substrate and environment

Tests carried out by institutions such as the Polytechnic University of Cartagena demonstrate that the planting density and the substrate type affect the development, height, and number of leaves in hydroponic crops. For example, in lettuce, a high density produces shorter plants with a greater number of leaves, an advantage for fresh-cut production. vermiculite It usually favors better development in many cases.

Monitoring environmental conditions, maintaining adequate water oxygenation, and adjusting the pH and electrical conductivity of the nutrient solution are key to obtaining uniform, high-quality harvests.

Is hydroponic farming profitable?

Hydroponics requires a higher initial investment than conventional agriculture, but the benefits in yield, quality, crop rotation and resource savings They tend to be highly rewarding. For producers with access to markets such as the hospitality industry, convenience stores, supermarkets, and gourmet shops, profitability is particularly high.

Factors influencing profitability:

• Fast production cycle: allows harvesting several times a year.
• High planting density: Maximize available space.
• Reduction of losses due to pests and diseases: Controls and absence of ground minimize incidents.
• Optimizing water and fertilizer consumption: Internal recycling minimizes costs and waste.

Related article:

Complete Guide to Indoor Hydroponic Grow Tents: Types, Equipment, and Professional Solutions

For those looking to make their agricultural production more efficient as well as for those who want to grow at home, hydroponics is a future strategy that combines technology, sustainability, and food quality. Its flexibility, rapid return on investment, and automation capabilities make it a fundamental tool to address the challenges of modern agriculture.