megacrop 2 part

Hi i am new to dry ferts and wondering if the people using megacrop 2 part can give me a few pointers pls! in flood and drain do i just use the amounts recomended and should i be using any additives with it ? i hear about cal deficiancy with it is that still a problem ?

also what should i ph at and can i just top off the res with new nutrient water and then re adjust ph ?

what are some pros and cons about this product?

I do not recommend using Mega Crop in any type of hydro. It is great in soil, but it has too many organic components that will feed bad bacteria/algae and allow them to grow like crazy in hydro.

I highly recommend Jacks 321 hydro formula. It is cheaper than Mega Crop and has zero organic ingredients.

For PH, you want it between about 5.5 and 6.

You also want your nute strength to stay the same as much as possible, so its better to toss the rez and start over every week or so or as needed. If you need to top off - make sure the EC/PPM stays the same by adding more nutes as needed.

As far as mixing strength - let your plants tell you how much they need. When starting seedlings, keep it low - no more than 200 PPM over what ever your water starts at. As they grow, watch the color. If they look pale, increase PPM's. If they look too dark or burned, decrease PPM's. There is no single perfect value for every grow.

oh thanks for the hydro tip i was told that the new megacrop 2 part was good in hydro.. guess i was getting bad info. only grabbed a small batch of nutes for testing but maybe i will just use it on the mothers instead now., usually just use gaia green for the moms

rollin204 said:

can i just top off the res with new nutrient water and then re adjust ph ?

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I only top off with premixed nute water. No mixing new on top of old.

You should be fine with the MC 2part. It's a virtual copy of Jacks 5-12-26, with a micro pinch of extra chit added.

Epsom may be needed depending on your mix and grow.



I keep Mg about half of Ca until later flower. (I use Jacks because I get it local)

TintEastwood said:

I only top off with premixed nute water. No mixing new on top of old.

You should be fine with the MC 2part. It's a virtual copy of Jacks 5-12-26, with a micro pinch of extra chit added.

Epsom may be needed depending on your mix and grow.


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I keep Mg about half of Ca until later flower. (I use Jacks because I get it local)

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thank you for that chart! i was looking around for one lol mg = magnesium and ca = calcium ?

Some ppm breakdowns...

Be sure to play with the Greenleaf calculator. The elememtal ppm tab.

TintEastwood said:

You should be fine with the MC 2part. It's a virtual copy of Jacks 5-12-26, with a micro pinch of extra chit added

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Mega Crop 2 part contains "plant sourced" amino acids. Jacks is pure minerals. True, the 2 part is better than the original, but still has organic ingredients, so I cant recomend it.

Larry3215 said:

Mega Crop 2 part contains "plant sourced" amino acids. Jacks is pure minerals. True, the 2 part is better than the original, but still has organic ingredients, so I cant recomend it.

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Think the megacrop 2 part will work fine in coco or promix?

Larry3215 said:

Mega Crop 2 part contains "plant sourced" amino acids. Jacks is pure minerals. True, the 2 part is better than the original, but still has organic ingredients, so I cant recomend it.

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Nothing wrong with soy isolate IMO. I have not much to complain about running Mega Crop 2 part in Aero. It's a little dirtier than Jacks but Jacks is also not accessible in EU. MC is also a little cheaper.

It works for me, I run a "sterile" system.

KhanTheOG said:

Think the megacrop 2 part will work fine in coco or promix?

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Yes, it's a complete plant food with added amino acids. But Mega Crop one part is pretty solid in soil and Coir, then you also get some added kelp and COS(chitosan oligosaccharide).

I got an email from them saying that they are changing the formula for the 2-part and that it will be out by the end of May. Hopefully somebody can post some info on it. I'm wary because I like it the way that it is currently.

Snowback said:

I got an email from them saying that they are changing the formula for the 2-part and that it will be out by the end of May. Hopefully somebody can post some info on it. I'm wary because I like it the way that it is currently.

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just got some of the new 2part formula, so far so good after 16 days in 8gal dwc. ph is mostly stable and slowly drifts up over the course of 5-7 days. i ph back down 5.7/5.8 and let it rise until 6.3/6.4. i am also running bennies in the res. it still doesnt dissolve completely, like 99%, but i did notice some particles after 24hrs of trying to get it to dissolve. not a big deal for me since im a single res running bennies+compost teas.

Thanks for the review. I still haven't tried it.