[gmanwho]

Originally Posted by Dave Coulier

FERTILIZER:
The non-control seedlings were fertigated on a near daily basis using GH 3 Part Flora series, Agsil 16h and Sequestrene 138. The control received RO water only on nearly a daily basis.

Nutrient Analysis:
N (NO3-): 150
N (NH4+): 11.926
K: 187
P: 45
Mg: 16.90
Ca: 127.92
S: 5.59
Fe:3.058
Zn: 0.384
B: 0.756
Cu:0.256
Mo:0.205
Mn:1.279
Si:61
Na:0
Cl:0

Mg, and S are low, but we will see if there are any issues with that as we go along.

So what was the ratio of each of the 3 part to equall that 80n 0r 160n? Mil per gallon of each GH part?

been using the GH micro/bloom lucas head etc.. ratios for some time. think on my past i always used 2mil micro/3 mil bloom per gal for seedlings. then up to 4/6, to 6/9 8/10.

bsafe.....

[Dave Coulier]

Here is the break down of ml/g of GH 3 Part Flora series.

Micro: 10.25ml/gallon
Gro: 6.75ml/gallon
Bloom: 2.25ml/gallon

I used HydroBuddy to formulate my nutrient mix. I love that software.

For the 80N solution I just took the 160N solution and diluted it by half.

Agsil 16h @1.46gr/gallon provides 61ppm Si & 37ppm K.

Sequestrene 138 @.032gr/gallon provides .5ppm Fe. Stock solutions are required here.

[Dave Coulier]

Day 14

The seedlings were two weeks old at this point. Its at this point, about 9-10 days after first fertilization, where we really start to see a significant difference between Control and the other two groups of fertilized seedlings.

There's only one week worth of photo updates to come. The next one will be delivered in two days. Enjoy these for now.

[Dave Coulier]

Day 21

We've officially reached the end of this little experiment. I said at the beginning of this thread that the plants with the highest feed rate are likely to be the fastest growing. It just doesn't make any sense that a plant given no food for two or 3 weeks of its life will thrive. People confuse cotyledons as a bank full of nutrients, but in reality they're enough for germination and unfolding of the first leaves, but after that nutrients need to be applied in quick order for vigorous growth.

If Cannabis seeds utilized hypogeal germination, then the cotyledons would be storage organs of nutrients, and there would be some truth to the myth of seedlings not needing food for 2+weeks, but that wasn't the case in this experiment of mine.

Break out the nutrients and get them ready to go from early on growers. Thanks to the results of this experiment I felt brave enough to feed the same 160ppm N mixture to 3 GN Thai Stick Seedlings on day 2 from germination. Anyone want to guess what happened?

Now for the stuff you all really want to see. The pics.

[Dave Coulier]

[Dave Coulier]

Which one here was fed nutrients?

It was also on day 21 that plants began showing sex under 12/12 Lighting. All of the plants fed 160N showed sex by days 21-23. With 4/5 being female. The plants fed 80N showed sex by days 24-28. With 3/4 being female. The control plants were so stunted, sex was impossible to determine. I culled them at this point and started some GN Thai Stick in their place.

[TheRealHash]

Originally Posted by Dave Coulier

Its funny you mention sex expression possibly being affected by feed level. I had the same thought after I found 4 of 5 girls in one particular group at the end of the experiment. I wont ruin which group it was. That'll come later, but there could be a link between feed level and sex expression..

Originally Posted by Chimera

Q: Can I increase my odds of getting a male for breeding?

A:, No, gender is determined genetically.

Originally Posted by Chimera

...Cannabis gender is controlled genetically, end of story. This is not news, it's well documented in the scientific literature, I can test for gender as of the moment the individual pops through the shell and shows the first piece of true leaf using a PCR method of detection for specific genetic sequences.

Cannabis gender is controlled by an XY system of sexual determination, with the heterogametic sex (XY) being the staminate or male gender.

aridbud post up the results of your experiment, and the statistical methods you used to conform your results vs expected probabilities.

The rest is hearsay and is completely false.

-Chimera

Originally Posted by Chimera

... I've germinated many many thousands of seeds in my day and all the regular seeds statistically approach 50/50 males:females the more seeds you grow. When you grow smaller lots you 'think' you see things that you assume make the gender lean towards one direction or another, but as the population size grows the apparent 'effect' disappears. I've grown many sets of seeds and used genetic markers to screen for the presence of the Y chromosome and it is %100 percent concordant with gender outcome.

You can alter gender expression with ethylene blockers or by spraying males with ethephon, you can pull crazy stresses on plants and make them show as intersex, but that effect is transient and does not alter the gender. Gender is determined by genetics, as stated previously, not by environment. This has been discussed ad nauseum over a series of internet fora, including this one so I'm not going to rehash it all here.

You can lead a horse to water....

-Chimera

From- "Can I increase my odds of getting a male for breeding?" Thread

https://www.icmag.com/ic/showthread.php?t=279805

[Dave Coulier]

Thanks for the link Realhash, even though your a party pooper.

[VerdantGreen]

interesting stuff dave, thanks for the well executed comparison!

so my seedling mix is 'unferted' except for about 10% EWC

can you tell me what percentage of 'full strength' the 160 ppm feed is?

then i can try to convert it to the correct strength of basic 'organic grow' liquid feed.

i generally start at about quarter strength for seedlings and clones.

VG

[TheRealHash]

Use a PPM meter yo~

edit: oh nm I just remember some organic nutes won't read on a PPM reader