How To Solve Nutrient Deficiencies In Marijuana Plants 

By Robert Bergman, ILoveGrowingMarijuana.com 1 – Alfalfa and Cottonseed Meal To correct nitrogen deficiencies in your marijuana garden, adding granulated products made from alfalfa and/or cottonseed to the soil provides protein which counteracts the deficiency. Pressed alfalfa hay and the remaining solids after cotton seeds have been pressed for oil …

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Maximize Cannabis Growth @ 700, 1,500 or 2,000 µmol/m2/s? And, What About CO2?

Words and images by Richard Jones. How ‘high’ must Photosynthetic Photon Flux Density (PPFD, µmol/m2/s) be to induce peak photosynthesis in Cannabis? In 2008, Chandra measured a maximum rate of photosynthesis at 1,500 µmol/m2/s. In 2015, Chandra conducted a similar assessment and measured a maximum rate of photosynthesis at 2,000 …

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A History of LEDS and Weed

Most people have not heard of Paul Gray, but his contributions to the cannabis industry are something most of us can cheer about. It all started when he was growing the infamous green crack. He wanted to figure out a way to make the already potent strain even stronger. After …

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