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Hydroponics II - Hydroponic Management

Course CodeBHT213
Fee CodeS2
Duration (approx)100 hours
QualificationStatement of Attainment

Study hydroponics management online - Start course at any time to suit you

  • Learn in depth hydroponics management of major commercial crops
  • Gain important harvest and post-harvest techniques
  • Improve your yields and gains
  • Value add to your products with salad mixes
  • Reduce damage produce
  • Save yourself time and money by preventing costly mistakes


Develop your capacity to make informed decisions regarding the management of commercially significant hydroponic crops. This course was developed to cover key issues which have been identified as recurrent problems for many experienced growers. It is suitable for anyone who has either completed hydroponics I, or alternatively, has significant prior experience.

Comment from a Student" Having completed the Advanced Hydroponics Course, I have since gone on to open my own successful hydroponics retail shop, now in it's third year of trading"
- Ted

This quality course contains 11 Lessons each with Set Tasks and 11 Assignments. Lessons covered include plant growth, evaluating procedures through trials, harvest & post harvest, tomatoes, capsicum, lettuce & greens, curcubits, strawberries, roses, carnations and orchids.

Lesson Structure

There are 11 lessons in this course:

  1. How the Crop Plant Grows
    • Understanding how a plant grows in hydroponics
    • Plant growth factors
    • Roots, Stems. Leaves, Reproductive Parts
    • Manipulating and controlling growth
    • Light Levels, Air Temperature, Root Zone Temperature, Relative Humidity, Carbon Dioxide and Oxygen, etc
    • Heating and Ventilation Systems
    • Thermal Screens
    • Blackout, Shading and Lighting Equipment
    • Day Length Manipulation
    • Irrigation and Nutrition Control
    • Links to Weather Station
    • Controlling Plant Growth: Stopping, Spacing, Disbudding, Trimming, Training
    • Growth Control: Chemical and Cultural
    • Pest and Disease Disorder Control
    • Intercropping
    • Plant troubleshooting
    • Resources
    • Fruit set management
    • Pollination issues
    • Flower initiation
    • Flower and fruit development
  2. How to Run a Small Evaluation Trial
    • What is a Hydroponic Trial?
    • Running a Crop trial
    • Setting up a Comparison Trial
    • Records and Recording
    • Evaluating the Trial
    • Research Methodology
    • Experimentation
    • Steps for Collecting Data
  3. Harvest and Post Harvest
    • Importance of Harvest and Post Harvest Management
    • Understanding Harvested Crop Physiology
    • Ripening of Fruit
    • Respiration
    • How and When to Harvest
    • Preparing Salad Mixes from Harvested Hydroponic Produce
    • Prevention of Bruising and Post Harvest Rots
    • Packaging
    • CA and MA Storage
    • Chilling Damage and Storage Temperatures
    • Harvesting and Grading Vegetables
    • Grading Standards
    • Fruit Grading Systems
    • Mechanised Grading
    • Grading Equipment
    • Harvesting Cut Flowers; stage, shelf life.
    • Post Harvest Treatments for Flowers
    • Grading Standards for Flowers
    • Conditioning and Packaging Flowers
    • Marketing: wholesale, supermarket, export, contract, local retailers, etc.
  4. Tomatoes
    • Growing Hydroponic Tomatoes
    • Growing conditions
    • Nutrition
    • Suitable Systems
    • Culture
    • Problem Management
    • Capsicum
  5. Growing Capsicums; Bell Peppers in Hydroponics
    • Growing conditions
    • Nutrition
    • Suitable Systems
    • Culture
    • Problem Management
  6. Lettuce, Salad Greens and Foliage Herb Crops
    • Lettuce
    • Celery
    • Chicory
    • Endive
    • Parsley
    • Spinach
    • Basil
    • Marjoram
    • Mint
    • Sage
    • Thyme
  7. Cucurbits (Cucumber and Melons)
    • Growing Hydroponic Cucumbers
    • Growing conditions
    • Nutrition
    • Suitable Systems
    • Culture
    • Problem Management
    • Other Cucurbits in Hydroponics; Marrow, Zucchini, Melon, Watermelon, Pumpkin
  8. Strawberries
    • Growing Strawberries in Hydroponics
    • Growing conditions
    • Nutrition
    • Suitable Systems
    • Culture
    • Problem Management
  9. Roses
    • Growing Roses in Hydroponics
    • Growing conditions
    • Nutrition
    • Suitable Systems
    • Culture
    • Problem Management
  10. Carnations
    • Growing Carnations in Hydroponics
    • Growing conditions
    • Nutrition
    • Suitable Systems
    • Culture
    • Problem Management
  11. Orchids
    • Growing Orchids in Hydroponics
    • Growing conditions
    • Nutrition
    • Suitable Systems
    • Culture
    • Problem Management
    • Harvest and Post Harvest for different Orchid Genera

Each lesson culminates in an assignment which is submitted to the school, marked by the school's tutors and returned to you with any relevant suggestions, comments, and if necessary, extra reading.

  • Interview two different people who have experience seriously growing plants in hydroponics. These might be hydroponic shop owners, commercial growers, or even just keen amateurs. They should be people who can answer the questions below from experience.  Ask each of these people the following questions and make notes of their answers:
  • What has been the most difficult plant variety you have grown in hydroponics? This should be something you have succeeded with, but have had to put extra effort into succeeding with; and perhaps success has only come after a second or third attempt.
  • What type of system did you use to grow this in?
  • What do you think was the most critical factor in manipulating the growth of this plant; how did you control that factor, and how did your action affect the plant’s growth?
  • What type of commercial crops are most suited to commercial hydroponic farming in your locality, and why? Locate information on hydroponic trials that have been conducted by others.
  • Information you find might include evaluations of particular crops or varieties, evaluations of particular technology for hydroponics, or evaluation of various systems or methods for particular crops.
  • You should try to find information from sources such as hydroponics magazines and journals, hydroponics books, the Internet, hydroponics experts, and any other sources you can think of.


There are many alternative strategies that can be used in hydroponics. As a starting point, most growers decide what crops they wish to grow, then select a system suited to those crops. The main systems, NFT, rockwool and aggregate, are described in detail in chapters 5, 6 and 7 of Commercial Hydroponics.

Regardless of the system chosen, growers must tailor their cropping strategies to ensure market success. There are many variables that can help the grower to make the most of his or her system. For example, altering the feeding and watering regime, changing the crop spacing, modifying the plant support system, or perhaps using new computer-automated equipment can significantly improve production.

An important aim of tailoring each operation is to use space more efficiently, and hence improve commercial viability. Some of the key factors in using hydroponic space efficiently are described below.

Plant Spacing
Plant spacing is determined by the crop species’ growth habit. All plants will grow quickly and uniformly until available light energy is reduced. Spacing then plays an important function. The closer the spacing of flowers, the smaller the stem and blooms that are produced. Generally, more space is required between plants in winter than in summer because of less available light. The seed suppliers often offer a recommended spacing and the grower’s experience will confirm this.

To reduce the potential of disease spread and foliage damage it is preferable that foliage of each plant does not touch. This is often difficult as crops mature, and pruning is often required to maintain space. Damaged foliage is open to invasion by unwanted pathogens.

Intercropping can mean growing two or more different plant species in the same greenhouse or hydroponic system or, more commonly, it has come to mean planting young seedlings of the same species in a crop of mature plants, as is carried out with tomatoes. In this case, as the older crop starts to drop off in production and is nearing the end of its useful life, young seedlings are planted either side of the older plants and allowed to develop in the same growing media.  As the older crop is removed, the younger plants have already established and begin to fruit, this reducing significantly any down time between one crop and the next.

Given that different plants have different growing requirements, it is often difficult to grow two different plants side by side, or in the same system in hydroponics. Tomatoes for example need a different nutrient mix for optimum fruit production to what lettuces need for producing a large tight leafy heart.

Roses might grow and flower in the same hydroponic bed for years, but many vegetables only grow for months. If the vegetable grows amongst roses, perhaps removing the vegetable roots might disturb the rose roots. Questions such as this do need serious consideration if you plan to grow different crops together in the same hydroponic system.


Meet some of our academics

John Mason Parks Manager, Nurseryman, Landscape Designer, Garden Writer and Consultant. Over 40 years experience; working in Victoria, Queensland and the UK. He is one of the most widely published garden writers in the world; author of more than 70 books and editor for 4 different gardening magazines. John has been recognised by his peers being made a fellow of the Institute of Horticulture in the UK, as well as by the Australian Institute of Horticulture.
Dr. Lynette MorganBroad expertise in horticulture and crop production. She travels widely as a partner in Suntec Horticultural Consultants, and has clients in central America, the USA, Caribbean, South East Asia, the Middle East, Australia and New Zealand.
Diana Cole B.A. (Hons), Dip. Horticulture, BTEC Dip. Garden Design, Diploma Chartered Institute of Personnel & Development, PTLLS (Preparing to Teach in the Life Long Learning Sector), P.D.C. In addition to the qualifications listed above, Diana holds City & Guild construction qualifications and an NPTC pesticide spraying licence (PA1/PA6). Diana runs her own landscape gardening business (Arbella Gardens). Active in many organisations including the British Trust for Conservation Volunteers.
Yvonne SharpeRHS Cert.Hort, Dip.Hort, M.Hort, Cert.Ed., Dip.Mgt. Over 30 years experience in business, education, management and horticulture. Former department head at a UK government vocational college. Yvonne has traveled widely within and beyond Europe, and has worked in many areas of horticulture from garden centres to horticultural therapy. She has served on industry committees and been actively involved with amateur garden clubs for decades.

Check out our eBooks

Commercial HydroponicsLearn to grow vegetables, fruit, cut flowers, herbs and other plants hydroponically. A classic, republished with new images, a new layout and revised text. Contains unique advice on growing 102 different plants hydroponically! 74 pages
Fruit, Vegetables and HerbsHome grown produce somehow has a special quality. Some say it tastes better, others believe it is just healthier. And there is no doubt it is cheaper! Watching plants grow from seed to harvest and knowing that the armful of vegies and herbs you have just gathered for the evening meal will be on the table within an hour or two of harvest, can be an exciting and satisfying experience.
Profitable FarmingDiscover new ways to make money from farming and how farms may adapt to change. This ebook explores specialised crops and livestock, farm tourism, cost reduction, value adding, long term planning and more. 76 pages
Growing and Knowing Dianthus and CarnationsIdentify carnations and dianthus with ease and get to know the ideal growing conditions that they need to prosper and produce beautiful flowers.