Course Overview
Controlled Environment Agriculture (CEA) is one of the fastest-growing sectors in global food production, attracting billions in investment annually. This course provides a comprehensive, practical education in hydroponics, vertical farming, and greenhouse technology β covering plant science, system design, climate control, crop production, and business economics.
Prerequisites
Basic plant biology helpful. Duration: 10 weeks self-paced.
Module 1: Introduction to Controlled Environment Agriculture
Learning Objectives
Define CEA and its advantages over field production; compare hydroponic system types; explain the business case for indoor farming.
Core Content
CEA refers to growing crops in enclosed environments where temperature, humidity, light, CO2, water, and nutrients are precisely controlled. Key advantages: year-round production, 95% less water than field agriculture, no pesticides, 10-100x higher yields per square foot, proximity to urban markets, and climate resilience.
CEA segments: Greenhouses (low-energy, sunlight-supplemented), vertical farms (multi-layer stacked growing, fully artificial LED lighting), plant factories (ultra-controlled research and production facilities), and container farms (repurposed shipping containers). Global CEA market: $50B in 2023, projected $150B by 2030.
Theory into Practice
1. Tour a virtual vertical farm: Watch “Inside the World’s Largest Vertical Farm” on YouTube (AeroFarms, Bowery Farming, AppHarvest documentaries). 2. Access Cornell University’s Controlled Environment Agriculture program open resources at cea.cals.cornell.edu β download their free CEA factsheets. 3. Explore the Plenty Inc. and Infarm technology briefings on their websites. 4. Calculate: If lettuce yields 4 heads/sq ft in soil vs 40 heads/sq ft in a vertical farm, what land savings does a 10,000 sq ft vertical farm provide?
Case Study: AeroFarms β Lessons from Scale
AeroFarms operated the world’s largest indoor vertical farm (70,000 sq ft in Newark, NJ) using aeroponic misting. Despite producing 130 types of greens with zero pesticides, they filed for bankruptcy in 2023 β highlighting the critical importance of energy cost management and operational efficiency in CEA. Key lesson: technology leadership does not guarantee profitability without disciplined unit economics.
Module 2: Hydroponic Systems β Design & Operation
Learning Objectives
Design and operate NFT, DWC, ebb-and-flow, and aeroponic systems; formulate complete nutrient solutions; troubleshoot common hydroponic failures.
Core Content
Major hydroponic system types: NFT (Nutrient Film Technique) β thin film of nutrient solution flows continuously over bare roots. Ideal for lettuce, herbs. Low substrate cost. DWC (Deep Water Culture) β roots suspended in oxygenated nutrient solution. Simple, high yields for cannabis, lettuce. Ebb-and-Flow (Flood & Drain) β substrate periodically flooded and drained. Versatile for many crops. Drip systems β nutrient solution dripped onto substrate (rockwool, coco coir, perlite). Industry standard for tomatoes, cucumbers, peppers. Aeroponics β roots misted with nutrient solution at high frequency. Fastest growth rates, highest technical complexity.
Nutrient solutions: Essential macronutrients (N, P, K, Ca, Mg, S) and micronutrients (Fe, Mn, Zn, B, Cu, Mo) must be balanced precisely. Target EC (Electrical Conductivity): 1.5-3.5 mS/cm depending on crop. Target pH: 5.5-6.5. Reference: Steiner nutrient solution, Hoagland solution. Tools: HI pens (Hanna Instruments), BlueLab controllers for automated monitoring.
Theory into Practice: Nutrient Solution Formulation
Using the free Nutrient Solution Calculator at hydroponicsource.com or hvg-hydro.com: (1) Formulate a complete nutrient solution for tomatoes at vegetative stage in 1,000 liters of water using commercial fertilizer salts; (2) Calculate required quantities of calcium nitrate, potassium nitrate, monopotassium phosphate, magnesium sulfate, and micronutrient mix; (3) Verify target EC and pH; (4) Calculate the daily cost per plant.
Module 3: LED Lighting, Climate Control & Energy Management
Core Content
Light is the primary production cost in vertical farming β electricity can represent 25-40% of operating costs. LED grow lights: measure efficiency in micromoles per joule (ΞΌmol/J). High-quality LEDs: 2.5-3.5 ΞΌmol/J (Fluence SPYDR, Heliospectra, Gavita). Target DLI (Daily Light Integral): 12-17 mol/m2/day for lettuce, 25-35 for tomatoes. Photoperiod manipulation allows year-round flowering control for strawberries and other day-length sensitive crops.
Climate control: HVAC systems must maintain temperature (16-28Β°C depending on crop), humidity (50-70% RH), and CO2 enrichment (800-1200 ppm for photosynthesis optimization). Building Management Systems (BMS) like Priva, Ridder, and Argus Controls automate all climate parameters. Energy management: heat recovery, LED efficiency improvements, solar integration, and off-peak electricity pricing are critical for profitability.
Module 4: Crop Production & Food Safety in CEA
Core Content
High-value CEA crops: leafy greens (lettuce, spinach, arugula β 35-50 day cycles), herbs (basil, cilantro β 21-28 days), microgreens (7-14 days, very high $/sq ft), tomatoes/cucumbers/peppers (longer cycles, higher complexity), strawberries, and cannabis (where legal). Food safety in CEA: GAP (Good Agricultural Practices), FSMA (Food Safety Modernization Act) compliance, HACCP plans, and water quality testing are essential. CEA’s closed system significantly reduces foodborne illness risk vs. field production.
Module 5: CEA Business Economics & Startup Guide
Core Content
Financial modeling for CEA operations: typical vertical farm costs: $10-30M construction for commercial scale (50,000+ sq ft). Container farms: $50,000-200,000 per unit. Operating costs: electricity (30-40%), labor (35-45%), nutrients/substrates (10-15%), packaging/logistics (10-15%). Revenue: premium indoor produce commands 20-50% price premium at retail. Break-even analysis: most vertical farms require 60-75% capacity utilization for profitability. Key success factors: energy cost below $0.08/kWh, automated harvesting, direct retail contracts, premium product differentiation.
Business Plan Final Project
Develop a complete CEA Business Plan for a 5,000 sq ft vertical farm producing leafy greens for a city of 500,000 people. Deliverables: (1) Market analysis and target customer, (2) Crop selection and production schedule, (3) System design and equipment specification, (4) Climate control and energy plan, (5) 3-year financial projections (P&L, cash flow, balance sheet), (6) Food safety plan, (7) Go-to-market strategy and pricing model.
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