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An exciting new study has been published by Frontiers in Plant Science on the effect of phosphorus supply on medical cannabis flower yield, cannabinoid content, and plant morphology. Before I get into the results, I want to note that P (phosphorus) concentrations are different from phosphate...

I'm having good success with coco and organic fertilizers. I think the key is adding CEC buffers like biochar, greensand, and compost/EWC (my mix is 10% combined biochar and EWC bv). Also coco seems to work best with slow release organic ferts like feather meal (for N) and granular minerals...

Finally a use for Vegimite 😂

Biochar is definitely good for boosting your CEC. Other things to consider include compost, worm castings, and greensand or zeolite. I add them all to my mix. Just be aware that the soil CEC only holds cations that typically end in "ium" (calcium, ammonium, potassium, etc.) as well as heavy...

So you know, all of the following contain synthetic ingredients and would not qualify as "certified organic" (except under a few rare and documented circumstances for two of them) and maybe for a third: This one isn't even on the OIM list. It contains Magnesium Nitrate which is not allowed in...

Ancient thread, but from the pics and the comments, the OP is not using correct pH irrigation water. Probably too basic (pH too high) as it looks like iron or sulfur deficiency. If this was a nitrogen issue the older leaves would be turning yellow, not the new growth as is occurring in the photos.

Anyone posting their recipes in this thread really needs to include their water source, pH, and hardness (Calcium and/or magnesium content) if applicable. Thanks.

Cation exchange capacity (CEC) is not determined by the amount of cations available in the soil solution; it is determined by the number of negatively charged exchange sites in the soil medium, which are exclusively provided by mineral soil particles (sand, silt, and clay) and organic matter...

I am not arguing that driving high makes you a better driver. I am arguing that the effect of driving high on driver safety and accident culpability is insignificant. Let's look to science... and the results to date of crash culpability studies have failed to demonstrate that drivers with...

There is a big problem with using this kind of study for determining safety thresholds that lawmakers simply do not recognize. The scientists themselves usually don't know what types/varieties of weed they're administering and it is virtually never reported, if it is known. I'm sure we can all...

Or we just need to institute instant runoff voting. While we're at it, make election days national holidays and make voting mandatory. Next let's eliminate the electoral college and put term limits on legislators. Last but not least, we must require states use independent commissions for voter...

Y'all are funny. Most educational workers (and anyone working with children), healthcare workers, government workers, financial specialists, and computer/IT managers will need to pass extensive background checks for their jobs. Many other jobs require hundreds of hours of education and/or...

That's definitely either Iron or Sulfur deficiency, most likely caused by high pH. So, did the flushing and pH correction fix the situation?

I know it's a long shot, but here goes anyway? I am a 40 year old professional horticulturist who has been offered a YEAR-ROUND position with a leading farm in Garberville but, of course, there is not suitable housing on the property for myself, my wife, and my 15 year old daughter. Housing is...