Why are living plants green?
Plant leaves are green because they reflect the green portion of the light spectrum. Green leaves do not absorb as much green light as blue and red radiation, which are the main colours required for photosynthesis, i.e. plant growth .
Light emitting diodes (LEDs) are changing the way crops grow.
LED's are finding new applications and greenhouse crop production by the day. Growers can now select various red, blue and white light radiation levels to control plant growth, flowering and many other aspects related to plant production.
Scientists are now able to use specific wavebands or light colours to:
Increase the nutritional values of crops
Enhance colour intensities of leaves and flowers
Use blue light to let cut flowers and edible crops last longer after harvesting, or
Control flowering periods, the shapes of plants, and much more!
Blue light prevents bolting, keeps plants compact with greener leaves, and prevents flowering, inter alias.
Red light, however, can be used to get longer stems or to stimulate flowering or increase fruit set.
Scientists at the University of Tennessee were able to increase antioxidants and anti-carcinogenic (canker avoidance) levels in plants.
They found that narrow wavelengths of blue light increased the nutrient levels in plants. It also increased the nutrient uptake and nutritional values of vegetables, which had a better aroma and more intense flavour.
Want to know more?
Attend our special two-day crash course on hydroponics and greenhouses on special request!
Where? In Pretoria
When? 7th to 8th May 2015.
Who will benefit? Everybody interested in plant growth, hydroponics or greenhouse technology. (Horticulturists, growers, keen gardeners, hobbyists, people involved in plant nurseries, landscaping etc.)
What not to expect: I will not waste your time by telling you how to fill plastic bags with the substrate, how to plant seedlings or how to stick drippers into plastic tubing, etc.
What will be covered? I prefer to focus on aspects of real importance for financial success, i.e.
Sustainable state-of-the-art greenhouse and hydroponics technology and techniques for optimised plant growth and viability
Pros and cons of various hydroponic systems and selection of the best systems for particular crops.
Water requirements, purification techniques and economic principles to improve poor quality or brackish water.
Aeration requirements and economic ventilation systems with reduced energy requirements to ensure better air quality, etc.
Light and lighting systems, their influences plant growth, quality and flowering control.
Climate, climate control and economics involved to ensure financial success
Using nature to reduce the cost of ventilation, heating, cooling and irrigation water.
Nutrient requirements, solutions and chemical element requirements, concentrations and acidity levels etc. for financial success; and cost reduction strategies that will not jeopardise crop yields, etc.
Substratre requirements and recommendations on suitable locally available low cost materials.
General hygiene and cost saving sterlilisation, pasteurisation and solarisation techniques for pest and disease control.
Greenhouse management and finances
Marketing and export requirements.
Registration? e-mail firstname.lastname@example.org to register – she has all the details!
Friends? Feel free to invite those that may be interested – forward this e-mail to them!
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