- Thread starter
- #141
TheFrizz
Well-Known Member
Great progress. What a plan, to have so many colas. How are your brixes? When you press the juice onto the refractometer you can see the blue/white line. The more blurry it is the more minerals are available to your plants. The Jenny is one fast grower! Keep it up, I'm interested and entertained.
Thanks Tomula! Also, great idea to check brixes, I will post a quick overview here and pics from my first time measuring brix today!
Alright folks, here is a bit of background info on brix in case you haven't heard of it before
Brix is a measurement of the amount of dissolved sugars and minerals in the sap of a plant. The nerdier definition is: "One degree Brix is 1 gram of sucrose in 100 grams of solution and represents the strength of the solution as percentage by mass"
It is considered by many to be a measure of the health of a plant, with higher values being desirable on a scale of ~0-30 degrees. The vast majority of data collected on brix is with regards to soil, because it originated in the 1800's as a way for winemakers to predict the quality of their vintage ahead of time. The higher the brix levels of their grapes, the better tasting the wine would be.
Fortunately, brix applies to every plant, not just wine grapes. Many organic soil growers can achieve brix levels over 20 in crops including cannabis. Anything over 12 is still considered quite good. From what I have read, regular supermarket produce routinely measures around 2-3 degrees brix, which is why it is lacking in both taste and nutrition. There is not a lot of information currently available on brix in hydro, but I have heard that hydro tends to result in lower brix in general compared to organic soil.
So how do you measure brix? Well with a handy tool called a refractometer! You squeeze a drop of sap from the fan leaves onto a glass plate which light passes through. Sugars are very large compared to water molecules and so they change the angle of refraction of the light as it passes through the glass. You read the angle by looking through the refractometer lens and finding the line where the white and blue meet.
Testing with a drop of distilled water to make sure it is working properly. Looks good! The reading is zero degrees because there are no dissolved minerals or sugars in the water. I took the picture by holding my phone up to the eyepiece of the refractometer so sorry if it's fuzzy
I pulled 3-4 medium/small leaves from each plant from the middle of the canopy. Then I used a garlic press to squeeze a drop from each plant onto the refractometer and record the value.
Jenny
Monique
Muffinz
Sidney
The values I recorded were:
Jenny- 7.5 degrees
Monique- 6 degrees
Muffinz- 10 degrees
Sidney- 10 degrees
At first I was upset because these values seemed low for how well the plants are growing overall. But then I did some thinking... I did some pretty heavy defol and bending on the girls 2 days ago and so they probably were using up their stored sugars (what was left, after I stripped off the biggest fans) to produce new growth and recover faster. Also, I have been feeding them at only around 300-400 ppm, and the growers that I have heard of achieving high brix in hydro (tomatoes and other veggies) use concentrations over 2k ppm.
Anyways, I plan on collecting brix data more frequently now that I have a starting point. My first goal is to get all of the girls above 12 degrees brix, and then see if maybe Sidney can push 20 in a couple weeks. Some of her leaves have that high brix shine already so I think she could do it I will first start by pushing the nutrient concentration closer to 1k ppm and see if that does the trick.