DIY and other hydroponic formulas.

[Creeperpark]

"Important information" Continued from the last page on bud rot.

Functions of the stomata
1. It helps in the transpiration of water, i.e., the loss of excess water from the plant.
2. Loss of water from the stomata creates an upward pull, i.e., suction pull, which helps in the absorption of water from the roots.
3. They help in exchange for gases.
4. It maintains the moisture balance according to weather by opening and closing.
5. Stomatal closure at night prevents water from escaping through pores. Google

 

[Creeperpark]

It's the end of this grow. I trimmed off most of the fan leaves. I shut off the 400 watt HPS light and now using a very low 60-watt LED so the plant will continue to transpire the water out of the stems. Plus a low-light setting will help the trichrome change to amber. Here are today's

bud shots

 

[unnamedmike]

High !
Im gonna leave it here ... Im using foliar Calcium chloride at 1500ppm, with awesome results. Great tool for sativa coco growers.

 

[Three Berries]

High !
Im gonna leave it here ... Im using foliar Calcium chloride at 1500ppm, with awesome results. Great tool for sativa coco growers.

And a little glycerin to it. It helps keep the CaCl2 active on the leaf surface as it absorbs moisture out of the air.

 

[unnamedmike]

Forgot that part, im using polysorbate instead of glycerin

 

[Creeperpark]

That's it! Summer is here and "no indoor growing" because of the Summer Heat. It's not worth the use of extra AC units to grow plants indoors. The only plants I grow during Summer are outdoor plants. Here's my just finished indoor harvest hanging.

 

[Creeperpark]

I'm opening this thread for cfl King.

 

[exploziv]

Great looking buds!

 

[detox²]

I have been working on the classic Hoagland solution for years using pure salts of Haifa.
What are your experiences with other fertilizer solutions and fertilizer brands. For the recycling system.


I'm thinking of changing purely to see how other solutions affect the same cuttings .... so far I'm very happy with this Hoagland for years.

Had Potassium Deficiencies with some crops. The N/K ratio is pretty much in direction of N. Could be very critical for crops like tomato, cucumber, squash or pumpkin. Surprised when you get big flowers when just using hoagland in flowering.

The NH4H2PO4 can be replaced by K2H2PO4 in equal molar amount imo. Meaning instead of 1M ammoniumphosphate stock make a 1M potassiumphosphate and give the 1 mL/L.

Hoagland is very high in Boron, other receipe I know have around 60% of this. It is however low in Zn and moderate in Cu.

I can post a receipt here including better micro nutrients, when I have access to it soon. I am not a home currently.

PEACE

 

[CannaT]

Had Potassium Deficiencies with some crops. The N/K ratio is pretty much in direction of N. Could be very critical for crops like tomato, cucumber, squash or pumpkin. Surprised when you get big flowers when just using hoagland in flowering.

The NH4H2PO4 can be replaced by K2H2PO4 in equal molar amount imo. Meaning instead of 1M ammoniumphosphate stock make a 1M potassiumphosphate and give the 1 mL/L.

Hoagland is very high in Boron, other receipe I know have around 60% of this. It is however low in Zn and moderate in Cu.

I can post a receipt here including better micro nutrients, when I have access to it soon. I am not a home currently.

PEACE

Its not original Hoagland its remaked from I think 60-70' and with some changes by me. Basicaly Hoag. reworked (later version) with some changes by me.

you can give your formula 2. 2 heads are always smarter than 1

 

[detox²]

Original Hoagland is from 1957, however there were some papers before. But they are very old, including some elements not essential for plants as cobalt.

The ppm you posted looked pretty much very original when i skimmed the fred. Can you post the g/L of the salts?

 

[CannaT]

Original Hoagland is from 1957, however there were some papers before. But they are very old, including some elements not essential for plants as cobalt.

The ppm you posted looked pretty much very original when i skimmed the fred. Can you post the g/L of the salts?

The Hoagland solution is a hydroponic nutrient solution that was newly developed by Hoagland and Snyder in 1933,[1] modified by Hoagland and Arnon in 1938,[2] and revised by Arnon in 1950

Arnon version from 1950s + my modification
Yild is not best but quality is on highest hydro level it can be.

 

[detox²]

Yes sorry, 1950:

This is the latest paper with Arnon

https://www.researchgate.net/file.P...5db&assetKey=AS:273668901408776@1442259158553

 

[detox²]

Hey Folks,

This is according to

Voedingsoplossingen voor groenten en bloemen geteeld in water of substraten = Nutrient solutions for vegetables and flowers grown in water or substrates

Link:

https://library.wur.nl/WebQuery/wurpubs/539943

Salts used (did this calculate myself):

This is the content of the Solution (calculation) in mol and g/L:

Notes:

Magnesium

I give 2 mM/L (double amount) of Magensiumsulfat as I made good experience with 2mM according to Hoagland we had been talking about in this thread. However, I rather assume this is either doing nothing or somehow benefical for Mg uptake playing against relative high amounts of K. K can be taken up via Mg transporters. Second, it might have a benefical effect on the overall pH. Tried it in Coconut with Tomato and Cannabis.

Potassiumsulfate

You can work without potassiumsulfate in veg. This results in 5,50 mmol/L K, what is fine.

Medium

I have tried it on coco with demin. water. pH was around 5,8 to 6,0 and on peat based substrate. Just normal substrate sold as potting soil everywhere. This must work in other systems too as rockwool etc. But I don't know about micro nutrients without chelatisation availability. And of course watch your pH, but you are good growers here, so you will manage that.


edit:

I use more Fe than orginal Straver/Sonneveld. 40 mikromol is far away from toxicity, but might not be needed for Cannabis. Plants are very different in their ability of using the chelated Fe as EDTA, e.g. grown corn in substrate, coco or deep water culture I used 100 or even 150 mikromole otherwise it is not going to have enough. This observation however cannot show if uptakerate is slow or if it simply needs more. Always supply Fe as demanded. This also can vary between different systems.

PEACE

 

[detox²]

Here is comparison to Hoagland

Bugbee suggests in this 2004 publication, the Zn and Cu in Hoagland 1950 is rather low as salts back then had been contaminated with Zn, Cu a lot. So for Zn Straver/Sonneveld suggested in the 1994 paper 3 to 5 mikromol and for Cu it is 0,5 to 1 mikromol.

https://www.researchgate.net/public...ulture/link/576b254408aef2a864d20f09/download