Jack's 3-2-1/Master Blend...replace calcium nitrate with calcium sulfate during flower?

Lou66 said:

Get a small aquarium "wave maker" pump (costs 30-40 bucks new, less if used). Then you can dissolve gypsum in just a few hours and fulfill your calcium needs. Micronized qualities are also available specially fot agriculture. They dissolve a bit quicker.

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Wondering if we can sit it in a bubbler for 24 hours? Just added a cup (top dress) to one of my 20 gallon pots. Little anxious about it, first use of the stuff in this manner. I sprayed it down a bit and half of it seemed to dissolve into the soil. (Down To Earth) I ordered the smallest box by mistake.

Week4@inCharge said:

Wondering if we can sit it in a bubbler for 24 hours? Just added a cup (top dress) to one of my 20 gallon pots. Little anxious about it, first use of the stuff in this manner. I sprayed it down a bit and half of it seemed to dissolve into the soil. (Down To Earth) I ordered the smallest box by mistake. View attachment 5378164

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I'd think any kind of constant agitation would do it?

Even Athena's Bloom mix has 170 ppm of N. According to my HydroBuddy a mix of Masterblend, Epsom, and Calcium Nitrate at 4/2.25/3.5 gets you fairly close to Athena's mix at an EC of 2.17. Masters is short on P and K which some of my newest strains appear to really need. So if you are ordering salts you may want to look at getting some Potassium Phosphate of some kind.

Tolerance Break said:

All good, I was asking for myself. I was thinking about how to use less nitrogen in the last few weeks of flower, and using jacks part A or finish with calmage came to mind

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Hows about cutting ALL Fertilizer, the last 2 weeks before harvest vs just cutting Nitrogen?

I cut all fertilizer 25% 2 weeks before harvest, and then another 25%, 1 week before harvest.

I use 4-19-38
15.5-0-0-Calcium Nitrate
Epsom salts.

I used to use Hydro Gardens weed formula.

4-20-39
Calcium Nitrate
Epsom Salts.

The Master Blend Tomato formula + the CN,,,, is as close as I will ever find to the Hydro Gardens. They had been making Plant Specific Fertilizers, since the 80s, and fert in general, since the 70s, and had been in business, since the 60s. Supply Chain Issues, during Covid, killed them.

But on the Hydro Gardens feed chart, they never cut Nitrogen. Say in an 8 weeks flowering strain, they cut back 25% of all fert in week 7, and another 25%, in week 8.
Also consider, I never feed my plants full strength, and I use Promix BX Medium.
They also recommended boosting MPK in weeks 3-4, then stopped, and then boost Epsom Salts, in weeks 5-6. Sulfur, is supposed to be critical, for terpene production.
AND at the same time, boost the PPM Slightly all the way from seedling-6 weeks flowering, on the base formula, calcium nitrate, Epsom Salts, all the way up to week 6. Never, did they suggest, to just cut Nitrogen alone.
I feed my seedlings about 5%-10% strength of everything, as soon as they break the soil.
I also start all seedlings, under either a 1000w Hortilux HPS, 1000w Hortilux Blue, 1000w DE CMH, Gavita 1700e, or `1150w Gavita DE HPS.

Ive used 1000w HID for seedlings, since they came out with HID lamps, in the 70s. I figure, they get full sun, in nature, so I blast them, from day 1.

Outside, I use 19-19-19 Granular fert, 0-0-52 Potassium Sulfate, and Calcitic, and Dolomitic Lime. I use 2/3 parts Calcitic to 1/3 parts Dolomite. To much dolomite in Clay soil, turns the soil, into concrete, and Calcitic, is better for faster PH Changes.

I top dress, every 6 weeks with the fertilizers, outside.