Originally Posted by BillFarthing
Here are some interesting specs on Megacrop:
NPK ratio: 2-1-3 is typically used for maturing tomatoes, maximizing bloom output with that ratio. If you bump up K with something like potassium silicate or a bloom booster, it throws the ratio off and you may get a magnesium deficiency.
NO3-:NH4+ ratio: 25:1- The most stable nutrient pH is ~9:1 (Trelease, S.F and Trelease, H.M., 1935, Science 78:438-439) The pH will probably drift up after a few days with Megacrop, but that's normal for hydroponics.
Ca:Mg- 3.4:1- Megacrop is probably suitable for coco at that ratio. Botanicare Cal-Mag Plus is 2:1, which is suitable for hydroculture. 2% magnesium might be a little low, but may be sufficient with chelators.
Si is 1.32 ppm at 455 ppm. If you like strong stems, you may want to invest in monosilicic acid with Megacrop.
Chitosan is one of my favorite biostimulants. When I contacted GLN to ask how much was in it, they said "not much".
Overall, I think it's a great all purpose nutrient for the price.
We designed the MEGA CROP NPK ratio directly around Cannabis/Hemp genetics, which is fairly similar to tomatoes (in fact we run Mega Crop on a hobby tomato farm locally with great results all the way through!).
If we made it into 2 formula, the veg formula would have slightly higher N, and the bloom would have slightly lower N. The different is pretty slight, so it functions very well as a 1 part for the whole lifecycle. Once we saw the difference was pretty similar, we just made a 1 part formula to make it "easier" for growers. To avoid Nitrogen toxicity, we are using high Nitrate nitrogen sources, so even in Flowering/Budding phase if you are a high dosage, it is more resistant to any Nitrogen toxicity. So this is another reason why it works very well as a true 1 part, you can bump up the dosage to boost PK and be more resistant to N toxicity issues.
See previous post, some growers will want a lower N in flower (higher PK), so the solution for this scenario is to just add in an extra PK booster. So, you would use 2 products, MC + PK booster, which is still only 2 products and far less than other companies laundry list feeding schedules.
So, a few different scenarios we considered, and in the future we might make some small changes.
1) Make MEGA CROP a dedicated Veg formula, then add in extra PK boost for flower in a 2-part
2) Make MC a hybrid veg/bloom formula as a universal 1 part, the one we chose.
3) Make MC a dedicated Bloom formula, and have a separate N booster for Veg phase
We actually might consider switching over to option 3) in the future. Since bloom phase for most indoor growers is the longest phase and veg is short (which seems to be a large amount of our customer base #'s), it would be more appropriate to have the formula focus on Bloom. Also the N boost for veg phase could be done with a simple Cal/Mag boost, since people already use this very commonly anyways. However, we have a few large outdoor growers who do extended veg phase, and they usually make very large orders.
To add in some even more factors to consider, the nutrients needs of Cannabis/Hemp can vary pretty significantly even between different strains/cultivars and mediums/soil used!
We set Si at what we considered a safe/ideal level, if the consensus is that it is too low, we can boost it in the future very easily.
As far as the Magnesium, we had a few people say they have "Cal Mag issues" which could mean their dosage is wrong, or using strains / medium which is Magnesium demanding. We are looking to increase Magnesium level 25% in the future to cover all bases. Usually the "CalMag issue" is just a "Mag" issue so we agree it would be nice to have a bit more Magnesium (chelated) in the future.
Thanks for your feedback! It was very clearly stated.