UVA and UVB
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THERE ARE reports of dramatic increases in essential oil production by flowering crops grown under lightbulbs with higher UV output .”
For example , numerous agricultural crops can synthesize simple phenolic compounds and flavonoids that act as sunscreens and remove damaging oxidants and free radicals . In certain crop species , these phenolic compounds can be extremely desirable and it can be beneficial to the farmer to enhance this aspect of production .
HOW CAN GROWERS UTILIZE THIS UV ENERGY WITHOUT CAUSING DAMAGE TO THEIR CROPS ? Although this is a fairly recent field of botanical science , there are reports of dramatic increases in essential oil production by flowering crops grown under lightbulbs with higher UV output . Modern metal halide ( MH ) and ceramic metal halide ( CMH ) lamps often include precisely calculated and optimized amounts of UVA and UVB output . High UV bulbs are generally recommended for use in the last two weeks of a flowering cycle once the generative development is completely established . This allows for a crop to continually develop in size and growth vigour while also protecting the flowers and canopy with increased resin production .
Like all aspects of horticulture , balance is the key to effective UV use . Too much or incorrect ratios of PAR / UVA / UVB will not help , but the correct amounts could encourage some incredibly useful results . Timing is also an important part of UV application . When given UVB throughout the entire growth cycle , sensitive plants such as leafy greens often display reduced growth ( plant height , dry weight , leaf area , etc .) and photosynthetic activity . Generally , the effectiveness of UVB also varies both among species and among individual strains or genetics of a given species . If you ’ re looking to utilize UV in your garden , it ’ s worth discussing with your local hydroponics store about the best approach for your chosen plant species .
Overall , it ’ s valuable to research the best applications of UV in your garden whilst catering to your specific plant ’ s physiological requirements . If we use this technology correctly , we can enjoy the delicious benefits of plant sunscreen . This means your flowers will smell better , your fruit will taste superior , and your herbs will have a higher potency in the kitchen . Enjoy the tan !
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