Rahul R. Pisal, Assistant professor, Department of Agronomy, N. M. College of Agriculture, Navsari Agricultural University, Navsari, Gujarat, India.
Payal A. Patel and P. Sowjanya Deepthi, Ph.D Scholar, Department of Agronomy, N. M. College of Agriculture, Navsari Agricultural University, Navsari, Gujarat, India.

Introduction: Agriculture has always been the backbone of human civilization, providing food, fiber and livelihood to a large portion of the global population. However, modern agriculture is facing serious challenges such as declining soil fertility, shrinking arable land, water scarcity, climate change, rapid urbanization and increasing population pressure. These challenges demand innovative and sustainable solutions to ensure food security for present and future generations. One such promising innovation is hydroponics farming, a modern technique of growing plants without soil by using nutrient-rich water solutions. Hydroponics has gained significant attention worldwide due to its ability to produce higher yields, use less water and allow cultivation in areas where traditional farming is not feasible. In recent years, hydroponics has emerged as an important component of high-tech and smart agriculture, especially in urban and peri-urban regions.

Hydroponics farming is not merely a replacement for soil-based agriculture but a scientifically advanced crop production system that ensures precise nutrient management, faster growth and better quality produce. It is particularly suitable for vegetables, leafy greens, herbs, flowers and some fruit crops. With increasing awareness about food safety, pesticide-free produce and sustainable farming practices, hydroponics is becoming an attractive option for farmers, entrepreneurs and researchers.

Concept and definition of hydroponics farming
The term hydroponics is derived from two Greek words:

Hydro meaning water and Ponos meaning labor or work

Thus, hydroponics literally means “working water”, indicating the cultivation of plants using water instead of soil.

Definition: Hydroponics is a method of growing plants without soil, where roots are supplied with a balanced nutrient solution dissolved in water, either directly or through an inert growing medium such as cocopeat, perlite, vermiculite, rockwool or gravel. In hydroponics, soil does not play any role in nutrient supply. Instead, all essential macro- and micronutrients required for plant growth are provided in precise quantities through water. The plant roots absorb nutrients directly, resulting in efficient nutrient uptake and faster growth.

Components and Technologies Involved in Hydroponics
Hydroponics farming requires a combination of biological, chemical and engineering components.

Nutrient Solution: The nutrient solution contains all essential plant nutrients:

Macronutrients: Nitrogen (N), Phosphorus (P), Potassium (K), Calcium (Ca), Magnesium (Mg), Sulphur (S)

Micronutrients: Iron (Fe), Manganese (Mn), Zinc (Zn), Copper (Cu), Boron (B), Molybdenum (Mo)

The nutrient solution must be properly balanced to avoid deficiencies or toxicities.
  • Water: Water quality is critical in hydroponics. Clean, low-salinity water with neutral pH is preferred.
  • Growing Media: Although soil is not used, inert media provide physical support to plants: Like, Cocopeat, Perlite, Vermiculite, Rockwool and Expanded clay pellets.
  • Containers and Channels: Plants are grown in trays, pipes, pots, or channels made of plastic or PVC.
  • Oxygen Supply: Roots require oxygen for respiration. Aeration is ensured through air pumps or flowing water systems.
  • Environmental Control: Advanced hydroponics uses: Temperature control, Humidity regulation, Artificial lighting (LEDs) and CO₂ enrichment.

Working Principles of Hydroponics Farming
The basic principle of hydroponics is direct nutrient availability to plant roots.

In soil-based farming: Nutrients are bound to soil particles.

Roots expend energy to extract nutrients.

In hydroponics:
  • Nutrients are already dissolved in water.
  • Roots absorb nutrients easily and efficiently.
  • Energy saved by the plant is diverted toward faster growth and higher yield.
  • Key parameters maintained in hydroponics include:
  • pH of nutrient solution (generally 5.5–6.5)
  • Electrical conductivity (EC) to measure nutrient concentration
  • Oxygen level in root zone
  • Light intensity and duration

Types of Hydroponics Systems
Several hydroponics systems are practiced worldwide based on crop type and investment capacity.

Wick System
  • Simplest system
  • Nutrients reach roots through capillary action
  • Suitable for small plants and beginners

Deep Water Culture (DWC)
  • Roots are suspended in nutrient solution
  • Oxygen supplied using air pumps
  • Suitable for leafy vegetables like lettuce

Nutrient Film Technique (NFT)
  • Thin film of nutrient solution flows continuously
  • Highly efficient system
  • Widely used for commercial vegetable production

Ebb and Flow System
  • Nutrient solution periodically floods and drains
  • Provides good oxygenation

Drip System
  • Nutrient solution delivered through drippers
  • Suitable for fruiting crops like tomato and cucumber

Aeroponics
  • Roots are misted with nutrient solution
  • Maximum oxygen availability
  • High-tech and expensive system

Applications of Hydroponics in Crop Production
Hydroponics is suitable for a wide range of crops:
  • Vegetable Crops: Lettuce, Spinach, Tomato, Cucumber, Capsicum etc.
  • Herbs and Leafy Greens: Basil, Coriander, Mint, Fenugreek etc.
  • Fruit Crops: Strawberry, Melon (under controlled conditions) etc.
  • Floriculture: Rose, Gerbera, Carnation, Orchids etc.
  • Nursery and Seedling Production: Healthy, disease-free seedlings and Uniform growth

Advantages of Hydroponics Farming
Hydroponics offers several benefits over conventional farming.
  • Efficient Water Use: Uses 70–90% less water than soil farming, Ideal for water-scarce regions
  • Higher Yield: Faster growth rates, Higher productivity per unit area
  • Better Nutrient Use Efficiency: No nutrient loss through leaching, Precise nutrient management
  • No Soil-Borne Diseases: Reduced pest and disease incidence, Less need for pesticides
  • Space Saving: Vertical farming possible, Suitable for urban areas
  • Year-Round Production: Independent of seasons, Stable income for farmers

Limitations and Challenges of Hydroponics
Despite its advantages, hydroponics has certain limitations.
  • High Initial Cost: Infrastructure and technology investment is high
  • Technical Knowledge Requirement: Requires trained manpower, Regular monitoring is essential
  • Power Dependency: Electricity required for pumps and climate control
  • Risk of System Failure: Pump or power failure can damage crops quickly
  • Limited Crop Diversity: Not suitable for all field crops like cereals

Indian Scenario of Hydroponics Farming
In India, hydroponics is gradually gaining popularity.
  • Current Status: Practiced mainly in urban and peri-urban areas, States like Maharashtra, Karnataka, Gujarat, Tamil Nadu and Telangana are leading.
  • Institutional Support: ICAR, State Agricultural Universities, National Horticulture Mission
  • Commercial Adoption: Used in polyhouses and greenhouses, Demand driven by hotels, restaurants and supermarkets.

Role of Hydroponics in Sustainable Agriculture
Hydroponics contributes significantly to sustainability:
  • Reduces water consumption
  • Minimizes fertilizer wastage
  • Reduces environmental pollution
  • Promotes urban agriculture
  • Enhances food security
  • Hydroponics aligns well with the principles of climate-smart agriculture and resource conservation.

Future Prospects of Hydroponics Farming
The future of hydroponics is promising due to:
  • Rapid urbanization
  • Demand for safe and fresh food
  • Integration with AI, IoT, and automation
  • Vertical farming and rooftop farming
  • Government support for smart agriculture

With technological advancements and cost reduction, hydroponics is expected to become more accessible to small and medium farmers.

Conclusion: Hydroponics farming represents a revolutionary shift in crop production systems by eliminating soil and optimizing resource use. It offers a sustainable, efficient and high-yielding alternative to conventional agriculture, especially in regions facing land and water constraints. Although challenges such as high initial cost and technical complexity exist, continuous research, innovation and capacity building can overcome these limitations.

In the context of climate change and food security, hydroponics has the potential to play a crucial role in shaping the future of agriculture. With proper policy support and awareness, hydroponics farming can significantly contribute to sustainable agricultural development and improved livelihoods.

References:

Barbosa, G. L., Gadelha, F. D. A., Kublik, N., Proctor, A., Reichelm, L., Weissinger, E., Wohlleb, G. M., & Halden, R. U. (2015). Comparison of land, water, and energy requirements of lettuce grown using hydroponic vs. conventional agricultural methods. International Journal of Environmental Research and Public Health, 12(6), 6879–6891. https://doi.org/10.3390/ijerph120606879.

FAO. (2014). Soilless culture for horticultural crop production. Food and Agriculture Organization of the United Nations.

ICAR. (2018). Protected cultivation and soilless farming in India. Indian Council of Agricultural Research, New Delhi.

Sardare, M. D., & Admane, S. V. (2013). A review on plant without soil—Hydroponics. International Journal of Research in Engineering and Technology, 2(3), 299–304.

Savvas, D. (2003). Hydroponics: A modern technology supporting the application of integrated crop management in greenhouse. Food, Agriculture & Environment, 1(1), 80–86.

Savvas, D., & Gruda, N. (2018). Application of soilless culture technologies in the modern greenhouse industry—A review. European Journal of Horticultural Science, 83(5), 280–293. https://doi.org/10.17660/eJHS.2018/83.5.2

Singh, A., & Singh, R. (2020). Hydroponics farming: An emerging trend in Indian agriculture. Indian Journal of Agricultural Sciences, 90(10), 1791–1798.